BioMed Research International

BioMed Research International / 2014 / Article
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Novel Psychoactive Substances and Behavioral Addictions

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Research Article | Open Access

Volume 2014 |Article ID 315062 |

Susana Jiménez-Murcia, Fernando Fernández-Aranda, Roser Granero, Mariano Chóliz, Melania La Verde, Eugenio Aguglia, Maria S. Signorelli, Gustavo M. Sá, Neus Aymamí, Mónica Gómez-Peña, Amparo del Pino-Gutiérrez, Laura Moragas, Ana B. Fagundo, Sarah Sauchelli, José A. Fernández-Formoso, José M. Menchón, "Video Game Addiction in Gambling Disorder: Clinical, Psychopathological, and Personality Correlates", BioMed Research International, vol. 2014, Article ID 315062, 11 pages, 2014.

Video Game Addiction in Gambling Disorder: Clinical, Psychopathological, and Personality Correlates

Academic Editor: Sophia Achab
Received04 Mar 2014
Revised23 May 2014
Accepted18 Jun 2014
Published14 Jul 2014


Objective. We studied the prevalences of video game use (VGU) and addiction (VGA) in gambling disorder (GD) patients and compared them with subjects with non-video game use (non-VGU) in relation to their gambling behavior, psychopathology, and personality characteristics. Method. A sample of 193 GD patients (121 non-VGU, 43 VGU, and 29 VGA) consecutively admitted to our pathological gambling unit participated in the study. Assessment. Measures included the video game dependency test (VDT), symptom checklist-90-revised, and the temperament and character inventory-revised, as well as a number of other GD indices. Results. In GD, the observed prevalence of VG (use or addiction) was 37.3% (),VGU 22.3% (), and VGA 15% (). Orthogonal polynomial contrast into logistic regression showed positive linear trends for VG level and GD severity and other measures of general psychopathology. After structural equation modeling, higher VG total scores were associated with younger age, general psychopathology, and specific personality traits, but not with GD severity. Patients’ sex and age were involved in the mediational pathways between personality traits and VG impairment. Conclusions. GD patients with VG are younger and present more dysfunctional personality traits, and more general psychopathology. The presence of VG did not affect the severity of GD.

1. Introduction

Research on gambling disorder (GD) is relatively new. In fact it was not until 1980 that the diagnostic and statistical manual of mental disorders, in its third edition (DSM-III), formally recognized this disorder (then was called pathological gambling) and included it in impulse- control disorders not elsewhere classified. Recently, in the DSM-5 [1], the nosological nature of the disorder was changed after reviewing the existing literature and evidence [2]; it was renamed as gambling disorder (GD) and classified in a new section called Substance Related and Addictive Disorders. Moreover, the illegal acts criterion was removed, the cut-off for the diagnosis of GD was modified from five to four criteria, and it was specified that symptoms had to be present for a period of 12 months [3].

During the review of the manual all possible nonsubstance addictions were analyzed, that is, pathological gambling, internet gaming, more general use of the Internet, shopping, exercise, and work. Finally, only GD was classed as a nonsubstance addiction, due to its clinical similarities, phenomenology, comorbidity, and treatment response with substance use disorders (SUDs) and also due to its shared neurobiological factors [4, 5].

However, the working committee of the DSM-5 decided to place Internet gaming disorder (IGD) in Section 3, which includes potential problems that require further investigation. This decision was based on the growing number of clinical and population studies of the disorder and its severe individual and interpersonal consequences [6]. Additionally, certain similarities in neurobiological features [7, 8], psychiatric comorbidity, and personality traits (sensation seeking, impulsivity, and low self-esteem) have recently been found between IGD with SUDs and GD [9]. Given that a wide range of tools and criteria have been used in the IGD scientific literature, it was decided to establish a set of nine diagnostic criteria, of which five or more must be present for a period of 12 months in order to standardize the definition and diagnosis of IGD [2, 6]. The inclusion of this condition in the DSM-5 will undoubtedly have a significant impact not only on future research [10] but also on the more clinical aspects such as destigmatization and improvements in diagnosis and treatment [11].

Although game users in industrialized countries tend to be over 18 [12], few studies have explored IGD in adult populations. Most of the ones carried out to date have been conducted in Europe [1316]. All coincide in indicating the association between the use of massively multiplayer online role-playing games (MMORPGs) and problematic or addictive behavior. Prevalence rates range between 0.2% and 1.3% for addictive use and 3.3% and 4.1% for problematic behavior [1416]. However, the study by Achab et al. [13] in an adult population, which adapted the DSM-IV-TR diagnostic criteria [17] for substance dependence disorders to MMORPGs, reported an addiction rate as high as 27.5%. The disparity of the results may be due to the differences in the assessment tools used by the studies or in the target population investigated (as suggested by King et al. [18]); while some studies concentrated on specific adult users more prone to developing addictive behaviors [13], others concentrated on young populations [19, 20]. However, several authors noted specific factors common to all participants (e.g., withdrawal, loss of control, high rates of tolerance, social and financial problems, problems with relatives, as well as mood swings, anxiety, irritability, sedentary lifestyle, decreased sleep, and abandonment of obligations, responsibilities, and leisure activities) [6, 11, 16, 18].

Other sociodemographic and clinical variables associated with adult IGD were age (the condition being more common in younger adults), higher education, residence in urban areas, and early age of onset [13]. The same features have been described in GD [21, 22]. In addition, both disorders have been associated with psychopathology such as depression, anxiety, and impulse-control disorders [6, 11, 23] and with dysfunctional personality traits such as high impulsivity and sensation seeking, neuroticism, introversion, and hostility [11, 24, 25].

The few studies that have compared GD with general new technology addiction [2629] coincide in reporting high levels of psychopathology and maladaptive personality traits in both disorders. However, most of them do not differentiate between IGD and the problem of more general use of the network or Internet addiction (IA). Tonioni et al. [28] reported not only similarities in relation to the association of depression, anxiety, and overall functioning but also differences in social patterns. Social skills were lower in the IA group, who presented lower social acceptance, cooperation, and social support in general. Regarding personality traits, both groups had low scores on reward dependence and self-directedness and high scores on self-transcendence. However, Muller et al. [29] identified higher neuroticism, lower conscientiousness, and extraversion in patients with IGD, the last two being statistical predictors of the condition. For Kuss [11], despite the existence of vulnerability factors common to the two disorders such as the involvement of brain reward circuits, impulsivity, deficits in executive functions, and attention, there were also marked clinical differences, apart from the preoccupation and obsessive use observed in both.

Although some studies have explored differences and commonalities between GD and IGD/VG, few have analyzed the use and abuse of VG in GD. Based on the results of previous studies [28], we hypothesized that there would be more similarities than differences between three groups of GD patients divided according to level of video game use: non-video game users (non-VGU), video game users (VGU), and video game addicts (VGA). However, we expected the group with GD plus VGA to display more severe psychopathology and dysfunctional personality traits (viz., higher levels of persistence, defined as perseverance in behavior despite frustration or fatigue).

Given the current lack of studies in clinical samples, especially in adult populations, the present study had three main goals: (1) to assess the current presence of video game addiction (VGA) symptoms in GD, (2) to establish whether the presence of VGA symptoms is associated with greater severity of GD symptomatology and general psychopathology, and (3) to assess whether the presence of more VGA symptoms is associated with specific temperament and character personality traits in GD patients.

2. Method

2.1. Participants

A total of 193 treatment-seeking GD patients participated in the current study (167 males and 26 females), consecutive referrals for assessment, and outpatient treatment at the Pathological Gambling Unit of the Psychiatric Department at the University Hospital of Bellvitge, Barcelona, Spain, 2013. All patients were diagnosed according to DSM-IV criteria using Stinchfield’s diagnostic questionnaire for pathological gambling [30, 31], conducted by experienced psychologists and psychiatrists. The majority of GD patients were slot machine gamblers (63.7%; ). According to the video game dependency test (VDT), GD patients were assigned post hoc to three groups: 121 (62.7%) with total VDT scores of 0 to the non-video game user group (non-VGU), 43 (22.3%) with total VDT scores between 1 and 19 to the video game user group (VGU), and 29 (15%) with total VDT scores 20 or more to the video game addict group (VGA). All were Internet gaming players.

As shown in Table 1, the mean age of the sample was 42.4 years old (SD = 13.4). Most subjects were employed (51.3%) and 33.2% were single or without a partner. Problem alcohol use was recorded in 18.1%, and substance abuse in 7.3%.

Total 1Non-VGU 1VGU 1VGA

Gender; (%)
 Males167 (86.5%)103 (85.1%)39 (90.7%)25 (86.2%)0.654
 Females26 (13.5%)18 (14.9%)4 (9.3%)4 (13.8%)
Age (years); mean (SD)42.4 (13.4)45.2 (13.6)37.3 (12.0)38.6 (11.1)0.001
Employed; (%)99 (51.3%)61 (50.4%)23 (53.5%)15 (51.7%)0.941
Marital status: single; (%)64 (33.2%)37 (30.6%)16 (37.2%)11 (37.9%)0.613
Smoker; (%)109 (56.5%)66 (54.5%)23 (53.5%)20 (69.0%)0.336
Use of alcohol; (%)35 (18.1%)20 (16.5%)7 (16.3%)8 (27.6%)0.358
Use of substances; (%)14 (7.3%)10 (8.3%)3 (7.0%)1 (3.4%)0.666
Age of onset PG problems; mean (SD)15.7 (10.8)17.2 (11.5)11.7 (9.0)15.4 (9.2)0.024
Duration of PG; mean (SD)5.94 (7.0)5.87 (6.8)5.03 (7.5)7.58 (7.0)0.370
Main gambling; (%)
 Slot machines123 (63.7%)77 (63.6%)26 (60.5%)20 (69.0%)0.762
 Bingo12 (6.2%)11 (9.1%)1 (2.3%)0 (0%)
 Lotteries13 (6.7%)11 (9.1%)1 (2.3%)1 (3.4%)
 Casino8 (4.1%)5 (4.1%)3 (7.0%)0 (0%)
 Other37 (19.2%)17 (14.0%)12 (27.9%)8 (27.6%)

SD: standard deviation. 1Non-VGU (non-video game users) (total VDT score of 0); VGU: video game users (total VDT score between 1 and 19); VGA: video game addicts (total VDT score of 20 or higher). Chi-square test for categorical outcomes and ANOVA for quantitative outcomes.
2.2. Instruments

A comprehensive assessment battery was administered which measured GD and VGA symptoms, sociodemographic characteristics, general psychopathology, and personality traits. The battery included internationally applied instruments in the GD field, such as the South Oaks Gambling Screen (SOGS) [32, 33] and Stinchfield’s diagnostic questionnaire for pathological gambling according to DSM-IV criteria [30, 31]. A validated Spanish-language scale entitled video game dependency test (Test de Dependencia de Videojuegos—VDT) [34], the symptom checklist-revised (SCL-90-R) [35], and the temperament and character inventory-revised [36] were also used.

2.2.1. South Oaks Gambling Screen (SOGS) [33]

The SOGS includes 20 items that produce a total score ranging from 0 to 20, with higher values indicating more severe psychopathology, and a score of five or more indicating probable pathological gambling (PG—now renamed as “gambling disorder” in DSM-5 [3, 37]). The psychometric properties of the Spanish version of the questionnaire have been shown to be satisfactory. Test-retest reliability was and internal consistency was 0.94 (Cronbach’s α). Convergent validity with regard to DSM-III-R criteria for pathological gambling [38] has been estimated at [39]. Furthermore, several studies in both clinical and general population samples have reported that the SOGS presents satisfactory psychometric properties as an index of gambling problem severity [4042].

2.2.2. Stinchfield’s Diagnostic Questionnaire for Pathological Gambling according to DSM-IV Criteria [30, 31]

This questionnaire measures the ten DSM-IV diagnostic criteria for PG with 19 items [43]. This scale has demonstrated satisfactory psychometric properties. Internal consistency, measured with Cronbach’s alpha, yielded values of for the general population and for a gambling treatment group. Convergent validity was estimated with a correlation with the SOGS as for a general population sample and for a gambling treatment sample. This scale has been adapted for the Spanish population by Jimenez-Murcia, Stinchfield, and colleagues [31] and has demonstrated adequate psychometric properties. Cronbach’s alpha in the present sample was very good ().

Video game dependency test (Test de Dependencia de Videojuegos—VDT) [34] is a reliable and valid 25-item self-report scale that assesses video game dependence and video game addiction. The test incorporates four factors that make up the principal characteristics of dependence: withdrawal, tolerance, problems caused by excessive use, and lack of control. Of these factors, as expected, withdrawal (defined as the distress arising from not being able to play video games and using games as a means of coping with adverse emotional states) accounts for the greatest part of the variance. The VDT total score is an indicator of video game addiction, with a cut-off score of 20. Internal consistency for the VG total score in the sample was excellent (alpha = 0.97). ROC procedures selected 20 as the best cut-off for the raw score, with a sensitivity of 80.0% and a specificity of 86.7% (area under the ROC curve = 0.80, ).

2.2.3. Temperament and Character Inventory-Revised (TCI-R) [36]

This is a 240-item questionnaire with 5-point Likert response options [44]. It measures seven dimensions of personality: four temperaments (harm avoidance, novelty seeking, reward dependence, and persistence) and three characters (self-directedness, cooperativeness, and self-transcendence). The Spanish version of the inventory has demonstrated satisfactory psychometric properties, ranging between 0.77 and 0.84 [45, 46].

2.2.4. Symptom Check List 90-Item-Revised (SCL-90-R) [35]

The SCL-90-R measures a broad range of psychological problems and psychopathology symptoms. The questionnaire contains 90 items and measures nine primary symptom dimensions: somatization, obsessive/compulsive, interpersonal sensitivity, depression, anxiety, hostility, phobic anxiety, paranoid ideation, and psychoticism. It also includes three global indices: a global severity index (GSI), designed to measure overall psychological distress; a positive symptom distress index (PSDI), designed to assess symptom intensity; and a positive symptom total (PST), which reflects self-reported symptoms. The GSI can be used as a summary of the subscales. Evaluation of the revised Spanish-language version generated an internal consistency (coefficient alpha) of 0.75 [35, 47].

Additional demographic, clinical, and social/family variables related to gambling were evaluated using a semistructured face-to-face clinical interview described elsewhere [48].

2.3. Procedure

In accordance with our unit’s assessment protocol and treatment model published elsewhere [48], we carried out a specific semistructured interview and functional analysis of GD. All the information was collected during the first interview. The remaining psychometric assessments mentioned above were administered to all subjects in a second session. Both interviews were conducted in a time frame of one week by a psychologist and a psychiatrist (each with more than 15 years of work experience in this field). GD patients were assigned to the three VG groups (non-VGU, VGU, and VGA) as described in Section 2.1 above. The Ethics Committee of the University Hospital of Bellvitge (Barcelona, Spain) approved the study, and informed consent was obtained from all participants.

2.4. Statistical Analysis

Analyses were carried out with SPSS20 for Windows. The three VG groups were compared through logistic regression for dichotomous outcomes and with ANOVA procedures for quantitative data. For both models (logistic regression and ANOVA), the VG groups were entered as independent variables and the variables measuring the GD related measures were considered the criteria. Orthogonal polynomial contrasts (used for grouping-ordered independent factors) performed a trend analysis to test patterns in data, the presence of linear and/or quadratic trends ( order comparisons were assessed, linear and quadratic trends, due to the levels of the grouping variable). Cohen’s was used to measure the effect size for pairwise comparison between groups (effect size was considered low with , moderate with , and high with ).

Partial correlations, adjusted for the participants’ sex and age, evaluated the association between VG total score (considered as a dimensional-metric variable) and clinical measures.

Stepwise multiple regression and binary logistic regression selected the best predictors of the VG scores (for each scale and for the binary classification based on the cut-off = 20), considering as input variables the participants’ sex, age, employment status, marital status, and personality profile (TCI-R scores).

The mediational hypotheses were tested through structural equation models (SEM) with STATA13 for Windows. Overall goodness-of-fit statistics were assessed through χ2 test, the root mean squared error of approximation (RMSEA), baseline comparison index (comparative fit index CFI), and residual size (standardized mean squared residual SMSR). A fit was considered to be good if [49] a nonsignificant result () was achieved in the χ2 test, if the RMSEA was lower than .08, if the CFI coefficients were higher than 0.90, and if SRMR was limited to 0.08. The equation level goodness-of-fit and the effect sizes were also estimated through coefficients for each equation and for the global model (these coefficients evaluated the fraction of variance explained by the indicator/indicators), multiple correlation (mc), and Bentler-Raykov multiple correlation (mc2) [50]. These last two coefficients reflect the relatedness of each dependent variable with the model’s linear prediction (in nonrecursive models, mc2 is computed to avoid the problem of obtaining inconsistent negative multiple correlations).

3. Results

3.1. Sociodemographic and Clinical Variables and Prevalence of VG

There were 121 non-VGU participants (62.7%, 95%CI: 55.7%–69.2%), 43 video game users (VGU) (22.3%, 95%CI: 17.0%–28.7%), and 29 video game addicts (VGA) (15.0%, 95%CI: 10.7%–20.7%). Table 1 includes the descriptive data of the total sample and the separate groups based on the video game questionnaire total raw scores. Statistical differences emerged for patients’ age (with non-VGU patients being older) and the age of onset of the GD problem (with non-VGU patients also presenting older ages of onset).

There was insufficient evidence to conclude that mean VDT total scores differed according to participants’ sex, employment status, marital status, use of tobacco, and use of substances.

3.2. Comparison between VG Groups for the GD Measures: SOGS and DSM-IV Questionnaires

The upper part of Table 2 shows the comparison of the SOGS scores (for each item and for the total score) between VG groups. The prevalence of patients who reported playing slot machines and other betting games was higher in the VGA group ( and ). A positive linear trend was found for “playing cards” (the higher the VG level, the higher the prevalence of patients reporting this form of gambling) and a quadratic trend for the prevalence of other forms of betting (prevalences were 15.4, 5.3, and 31.8 for non-VGU, VGU, and VGA, resp.). The mean SOGS-total score presented a positive linear trend with the VG level (this means that it increased from 9.7 for non-VGU to 10.1 to VGU and 11.2 to VGA, ).

1Non-VGU 1VGU 1VGA GroupLTQTEffect size

(1a) Card games; %27.35%33.33%52.17%0.0640.0220.5470.130.52*0.39
(1b) Horse racing; %3.42%0%0%0.3380.9980.9990.270.27
(1c) Sports events; %3.42%7.69%0%0.2870.9980.9980.190.270.41
(1d) Lottery/scratchcards; %84.62%84.62%91.30%0.6970.4090.5850.000.210.21
(1e) Casino; %24.79%41.03%26.09%0.1450.8950.0870.350.030.32
(1f) Bingo; %51.28%46.15%47.83%0.8410.7620.7290.100.070.03
(1g) Stock market; %5.13%5.13%0%0.5390.9980.9980.000.330.33
(1h) Slot machines; %81.20%89.74%100%0.0450.9980.9980.240.68*0.48
(1i) Other forms of gambling; %15.38%5.26%31.82%0.0220.0720.0320.340.390.73
(2) Amount of money spent: ≥300 euros; %53.85%66.67%52.17%0.3410.8830.1620.260.030.30
(3) Family history of gambling; %22.22%15.38%34.78%0.2080.2040.1320.180.280.46
(4) Going back to win back lost money; %91.38%89.74%100%0.3070.9980.9980.060.430.48
(5) Claiming to be winning when losing; %40.87%43.59%56.52%0.3850.1710.6070.060.320.26
(6) Problem recognition; %97.44%97.44%100%0.7400.9980.9980.000.230.23
(7) Gambling more than planned; %91.38%92.31%100%0.3470.9980.9980.030.430.41
(8) Being criticized; %66.09%74.36%82.61%0.2300.1270.9190.180.390.20
(9) Feeling guilty; %95.73%100%100%0.2560.9980.9990.300.30
(10) Inability to stop gambling; %92.24%92.31%100%0.3850.9980.9980.000.410.41
(11) Hiding signs of gambling; %69.83%74.36%78.26%0.6620.4170.9920.100.190.09
(12) Arguments with family/friends; %78.63%79.49%91.30%0.3690.1750.3940.020.360.34
(13) Arguments and fights; %74.53%71.43%73.91%0.9370.9510.7570.070.010.06
(14) Borrowing money and failing to return it; %46.15%41.03%52.17%0.6910.5980.4080.100.120.22
(15) Skipping work due to gambling; %43.59%46.15%65.22%0.1630.0620.3960.050.440.39
(16a) Taking money from home; %77.78%77.27%93.33%0.3750.1990.3300.010.450.47
(16b) Taking money from partner; %59.52%60.00%83.33%0.3000.1430.3790.010.55*0.54
(16c) Taking money from family; %77.08%86.96%87.50%0.5410.5140.7040.260.280.02
(16d) Borrowing from banks; %81.48%77.78%83.33%0.9180.8800.6790.090.050.14
(16e) Using credit cards; %77.78%91.67%84.62%0.3230.5890.2790.390.180.22
(16f) Borrowing from money lenders; %30.30%45.45%0%0.2390.9990.9990.320.93*1.29*
(16g) Money from sale of shares or other bank assets; %7.69%14.29%25.00%0.5530.3111.0000.210.480.27
(16h) Money from property sales; %41.67%50.00%20.00%0.5520.3690.3480.170.480.66*
(16i) Money from making out false checks; %8.00%0%0%0.6540.9991.0000.420.42

SOGS: total score; mean (SD)9.66 (3.2)10.1 (3.6)11.2 (2.4)0.1170.0430.6700.130.54*0.36

DSM1. Preoccupations with gambling; %73.95%80.95%86.96%0.3180.1910.9640.170.330.16
DSM2. Need to bet more money; %62.18%42.86%86.96%0.0020.0310.0010.390.59*1.04*
DSM3. Unsuccessful efforts to control; %90.76%95.24%100%0.2290.9980.9980.180.450.32
DSM4. Restless, irritable when not gambling; %59.66%71.43%73.91%0.2270.2030.6390.250.310.06
DSM5. Gambling to escape from problems; %73.95%64.29%82.61%0.2550.3820.1020.210.210.42
DSM6. Gambling again after losing money; %73.95%80.95%95.65%0.0620.0500.3420.170.63*0.47
DSM7. Lying to family members or others; %90.76%95.24%86.96%0.4940.5780.2600.180.120.29
DSM8. Committing illegal acts; %27.73%28.57%30.43%0.9650.7920.9550.020.060.04
DSM9. Losing a significant relationship, job,…; %78.99%80.95%91.30%0.3870.1840.4780.050.350.30
DSM10. Relying on others to provide money; %70.59%83.33%69.57%0.2500.9220.1160.310.020.33

DSM. Total criteria; mean (SD)7.03 (2.3)7.24 (1.9)8.04 (1.5)0.1140.0380.4710.100.52*0.47

SD: standard deviation. 1Non-VGU (non-video game users) (total VDT score of 0); VGU: video game users (total VDT score between 1 and 19); VGA: video game addicts (total VDT score of 20 or higher). LT: linear trend; QT: quadratic trend. 2Cohen’s for the comparisons: non-VGU versus VGU; non-VGU versus VGA; VGU versus VGA. *Bold: moderate ( ) to high ( ) effect size.

According to the DSM-IV questionnaire results (lower part of Table 2), the VGA had a statistically higher prevalence of patients reporting the presence of criterion A2 (“needs to bet more money,” ), and linear and quadratic trends were found for this symptom. A positive linear trend was found for criterion A6 (“gambles again after losing,” ) and for the means for the DSM-total criteria ().

Effect size measured through Cohen’s showed that for the dichotomous SOGS-items and DSM-criteria the highest differences were between non-VGU and VGA patients (within the moderate range for significant group comparisons, except for the item “other forms of gambling” and the criterion “needs to gamble more money”) and the lowest between VGU and VGA patients. Differences between non-VGA and VGA achieved moderate effect sizes for the SOGS-total score and the DSM-total criteria, and the other pairwise comparison achieved a low effect size.

3.3. Comparison between VG Groups for General Psychopathology and Personality

Table 3 shows the results of the ANOVA procedures comparing the SCL-90-R and the TCI-R mean scores between the three VG groups. All the SCL-90-R scales achieved significantly different means between the three groups. The significant linear trends obtained in the polynomial contrasts indicated that the higher the VG scores, the higher the SCL-90-R mean score (VGA > VGU > non-VGU). The additional significant quadratic trend indicated that while the mean differences between non-VGU and VGU were low, the differences between VGU and VGA were high. Cohen’s measuring the effect size for pairwise SCL-90-R and TCI-R comparisons showed that differences between non-VGU and VGU were low (except for TCI-R persistence score). Pairwise differences for the rest of the SCL-90-R scales obtained moderate to high effect sizes. For TCI-R scores, moderate differences were obtained for the self-directedness score for the pairwise comparison between VGA patients and the other two VG levels.

GroupTrendsEffect size
MeanSDMeanSDMeanSD LTQT 2Cohen’s

SCL-90: somatization1.130.870.950.911.691.090.0030.0300.0080.200.57*0.74*
SCL-90: obsessive/compulsive1.200.881.120.781.960.93<0.0010.0010.0050.100.84*0.98*
SCL-90: interpersonal sensitivity1.180.941.050.871.890.94<0.0010.0040.0060.140.76*0.93*
SCL-90: depression1.660.961.560.922.210.930.0100.0260.0360.110.58*0.70*
SCL-90: anxiety1.150.861.030.831.740.970.0020.0110.0130.140.64*0.79*
SCL-90: hostility1.000.880.800.761.671.08<0.0010.0070.0020.240.68*0.93*
SCL-90: phobic anxiety0.530.700.430.760.990.960.0070.0270.0230.140.55*0.65*
SCL-90: paranoia1.020.840.980.781.770.96<0.001<0.0010.0100.050.83*0.90*
SCL-90: psychoticism1.060.800.890.751.581.030.0020.0270.0070.220.56*0.77*
SCL-90: GSI score1.180.761.060.721.790.87<0.0010.0040.0030.160.75*0.91*
SCL-90: PST score49.4321.2548.9021.4565.0718.88<0.0010.0020.0350.020.78*0.80*
SCL-90: PSDI score1.990.641.800.562.340.640.0020.0070.0020.320.55*0.90*

TCI-R: novelty seeking108.3612.21108.5112.92110.2212.390.7780.5290.7440.010.150.14
TCI-R: harm avoidance104.0315.9398.9020.80106.5216.460.1570.9960.0540.280.150.41
TCI-R: reward dependence98.9213.70101.6210.2398.1113.970.4660.8830.2200.220.060.29
TCI-R: persistence103.5423.10114.7921.65112.8923.130.0120.0100.1350.50*0.400.08
TCI-R: self-directedness131.2720.93132.7721.02117.5618.560.0050.0120.0370.070.69*0.77*
TCI-R: cooperativeness132.9516.40132.6915.48125.7815.230.1070.0680.2820.020.450.45
TCI-R: self- transcendence62.7915.3560.6912.8266.8917.140.2610.4100.1560.150.250.41

VG: total score0.000.006.774.6044.2422.60<0.001<0.001<0.0012.08*2.77*2.30*

SD: standard deviation. LT: linear trend; QT: quadratic trend.
1Non-VGU (non-video game users) (total VDT score of 0); VGU: video game users (total VDT score between 1 and 19); VGA: video game addicts (total VDT score of 20 or higher).
2Cohen’s for the comparisons: non-VGU versus VGU; non-VGU versus VGA; VGU versus VGA. *Bold: moderate ( ) to high ( ) effect size.

A positive linear trend was also obtained for the relationship between the VG groups and the TCI-R mean score for persistence and a negative linear trend between the VG groups and the TCI-R mean scores for self-directedness. An additional quadratic trend for TCI-R self-directedness again showed low mean differences between non-VGU and VGU and higher mean differences between VGU and VGA.

3.4. Association between VG Scores and Clinical Outcomes

Partial correlations adjusted for the covariates patients’ sex and age showed that VG total scores correlated positively with all the SCL-90-R scores and negatively with the TCI-R self-directedness score (Table 4). The effect sizes of the correlations were in the moderate range.

SCL-90: somatization0.248
SCL-90: obsessive/compulsive0.295
SCL-90: interpersonal sensitivity0.291
SCL-90: depression0.221
SCL-90: anxiety0.258
SCL-90: hostility0.274
SCL-90: phobic anxiety0.270
SCL-90: paranoid ideation0.319
SCL-90: psychoticism0.245
SCL-90: GSI score0.297
SCL-90: PST score0.266
SCL-90: PSDI score0.227

TCI-R: novelty seeking0.085
TCI-R: harm avoidance0.089
TCI-R: reward dependence−0.055
TCI-R: persistence0.091
TCI-R: self-directedness−0.195
TCI-R: cooperativeness−0.104
TCI-R: self-transcendence0.118

Bold: significant correlation (.05 level).
3.5. Predictive Capacity of the Sociodemographic and the Personality Traits among VG Groups

The first stepwise linear regression included in Table 5 contains the best predictive model selected for the VG total score, considering the sociodemographic variables and the personality profile measured via the TCI-R questionnaire as independent variables. The only significant predictor was the TCI-R self-directedness score: the lower the TCI-R self-directedness score was, the higher the VG total score was.

Linear regression for outcome:Predictors 95% CI ( )

VG-total scale scoreTCI-R: self-directedness−0.172−0.1990.007−0.296;−0.048

Logistic regression for outcome:Predictors OR 95% CI (OR)

VGUAge (years)−0.0410.9600.0030.934;0.986
TCI-R: Persistence0.0161.0160.0331.001;1.030

VGATCI-R: self-directedness−0.0360.9650.0020.943;0.987

VGU: video game users (total VDT score between 1 and 19); VGA: video game addicts (total VDT score of 20 or higher).

The second model in Table 5 corresponds to the stepwise binary logistic regression evaluating the best predictors (entering in the model the same set of independent variables as in the previous multiple regression) of a score higher than 0 on the VG total scale (the dependent variable was coded 0 for non-VGU patients and 1 for VGU and VGA patients). Results showed that a greater likelihood of a VG above 0 (VGU and VGA) was associated with younger age and high TCI-R persistence scores.

The third model in Table 5 contains the best model for discriminating a VG total score above 20 (the dependent variable was coded 0 for non-VGU and VGU patients and 1 for VGA patients). The results showed that low TCI-R self-directedness scores increased the risk of VGA.

3.6. Pathways of the VG Level and GD Behavior

Figure 1 shows the diagram for the SEM that assesses the pathways for the outcomes VG behavior severity (measured through the VG total score) and severity of the GD (SOGS total score). Table 6 includes the statistics for the standardized coefficients of this model. The variables included in the SEM were selected from the results obtained in the previous stepwise regression models, which identified patients’ age and TCI-R persistence and self-directedness scores as the most relevant predictors for VG (sex was also included as an independent variable due to its strong association with GD). The dashed lines indicate nonsignificant links. The variables selected to adjust the pathway were the ones with the highest associations in the previous analyses. The indexes measuring the model level goodness-of-fit were adequate: (), RMSEA = 0.01, CFI = 1, and SRMR = 0.008. The overall for the pathway was 0.16.

Standard coefficientSE 95% CI for the coefficient

TCI-R persistence
 Sex (male)0.10686880.07565341.410.0158−0.0414092;0.2551468
 Age (years)−0.23682130.0732199−3.230.001−0.3803297;−0.0933129
TCI-R self-directedness
 Sex (male)0.14832160.07734181.920.0500.0032656;0.2999087
 Age (years)0.05190530.07842990.660.508−0.1018144;0.2056251
VG-total score
 TCI-R persistence0.15752150.07633312.060.0390.0079114;0.3071316
 TCI-R self-directedness−0.23759550.0728751−3.260.001−0.3804281;−0.0947629
 Sex (male)0.0309220.07689310.400.688−0.1197858;0.1816298
 Age (years)−0.07004880.0776069−0.900.367−0.2221556;0.082058
SOGS-total score
 TCI-R persistence0.11967490.07338961.630.103−0.0241661;0.2635159
 TCI-R self-directedness−0.32787950.0694936−4.720.000−0.4640846;−0.1916745
 Sex (male)0.03593770.07262240.490.621−0.1063995;0.1782749
 Age (years)−0.22352720.0713199−3.130.002−0.3633117;−0.0837427


Model level goodness-of-fit0.2910.5890.011.000.008

Equation level goodness-of-fitFittedVarianceResidual mcmc2

TCI-R persistence535.695741.93446493.76130.07828040.27978630.0782804
TCI-R self-directedness438.60299.393018429.20990.02141580.14634130.0214158
VG-total score302.484328.20133274.2830.09323240.30533980.0932324
SOGS-total score10.776442.0648618.7115810.19160880.43773140.1916088

mc = correlation between dependent variable and its prediction.
mc2 = Bentler-Raykov squared multiple correlation coefficient.

The VG level (measured by the VG total score) was high for patients with low TCI-R self-directedness and high TCI-R persistence scores. In addition, TCI-R trait persistence mediated the relationship between age and VG total score: younger subjects had higher TCI-R persistence scores, and a positive association was found between this personality trait and the VG score. TCI-R self-directedness also mediated the relationship between sex and VG total score. Men obtained higher scores on this personality trait, which was negatively associated with VG level.

GD severity (measured by the SOGS-total score) was not associated with VG total score, but it was associated with younger age, low TCI-R self-directedness scores, and high TCI-R persistence scores. Again, as in the case of VG, TCI-R self-directedness mediated the pathway between sex and GD level, and TCI-R persistence mediated the pathway between age and GD level.

4. Discussion

The current study assessed the prevalence of VG symptoms in a clinical sample of GD patients and explored the differences between VG groups (VGU versus VGA). Furthermore, we assessed the associations between the severity of VG symptoms and GD symptomatology, general psychopathology and personality traits, and clinical variables and then compared them with patients without VG use (non-VGU).

The main finding of the study was that the prevalence of VGA in a consecutive clinical sample of treatment-seeking GD individuals was 15%. This is in agreement with the literature, which describes an association between the presence of gambling problems and a more frequent use of and involvement in video games [51]. Moreover, our results show that the prevalence of VG problem use or addiction among GD patients is higher than in other similar studies, which ranged from 0.6% to 10%, despite our sample being older [16, 52]. However, the rates obtained in our study are consistent with those described in an adult population [13].

The presence of VG use (VGU and VGA) was associated with specific clinical variables such as younger age, but not with GD symptomatology as measured by means of SOCS or DSM-IV criteria. Previous literature reports suggest that age and gender are strong predictors of problematic or addictive use of video games [13, 20, 51], but not of the severity of the main GD [51, 52].

The second main finding was that both VGU and VGA patients presented higher general psychopathology. This is in agreement with the existing literature [28, 53], which reports an association between a higher number of VG symptoms and depression, anxiety, and social phobia. These emotional disturbances and social problems not only may be consequences of video game addiction [16] but may also be factors that contribute to the persistence of the disorder. Indeed, Kuss [11] describes how the preference for online social relationships, the need for escapism, and use of maladaptive coping strategies to deal with daily stressors become maintaining variables. Similarly, King and Delfabbro [54] consider the problematic use of video games to be associated with attempts to achieve self-esteem or to gain social acceptance.

A third main finding was that patients who made excessive use of VG (both VGU and VGA) presented more dysfunctional personality traits, namely, lower self-directedness and higher persistence. Other studies have also found specific personality traits such as irritability/aggression, impulsivity, neuroticism, loneliness, and introversion to be associated with VGA [52, 55].

The present study has several methodological limitations that need to be taken into account. First, the participants in the sample are only representative of GD patients who seek treatment, and therefore the findings obtained may not apply to all individuals with GD. Since only 7% to 12% of GD individuals seek help for their disorder, a community sample of GD might yield different results. Second, the use of a standardized self-administered questionnaire as the assessment procedure did not allow for an in-depth evaluation of specific axis I and axis II comorbid disorders.

5. Conclusions

This study adds to the limited literature on VGA in GD clinical samples and develops a pathway model to describe the associations between VG symptoms, clinical and sociodemographic characteristics, personality traits, and general psychopathology. Based on the findings of the model, we conclude that both VGU and VGA are driven by high levels of persistence and low levels of self-directedness, and that patients tend to be male and of younger age. Intervention strategies that focus on the training of these personality features and systematic screening for potential VGU/VGA are recommended.

Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.


Partial financial support was received from Ministerio de Economía y Competitividad (PSI2011-28349) and AGAUR (2009SGR1554). CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn) and CIBER Salud Mental (CIBERsam) are both initiatives of ISCIII.


  1. APA, Diagnostic and Statistical Manual of Mental Disorders, American Psychiatric Association, Washington , DC, USA, 3rd edition, 1980.
  2. N. M. Petry and C. P. O'Brien, “Internet gaming disorder and the DSM-5,” Addiction, vol. 108, no. 7, pp. 1186–1187, 2013. View at: Publisher Site | Google Scholar
  3. N. M. Petry, C. Blanco, R. Stinchfield, and R. Volberg, “An empirical evaluation of proposed changes for gambling diagnosis in the DSM-5,” Addiction, vol. 108, no. 3, pp. 575–581, 2013. View at: Publisher Site | Google Scholar
  4. R. F. Leeman and M. N. Potenza, “Similarities and differences between pathological gambling and substance use disorders: a focus on impulsivity and compulsivity,” Psychopharmacology, vol. 219, no. 2, pp. 469–490, 2012. View at: Publisher Site | Google Scholar
  5. M. N. Potenza, “How central is dopamine to pathological gambling or gambling disorder?” Frontiers in Behavioral Neuroscience, vol. 23, no. 7, p. 206, 2013. View at: Google Scholar
  6. N. M. Petry, F. Rehbein, D. A. Gentile et al., “An international consensus for assessing internet gaming disorder using the new DSM-5 approach,” Addiction, 2014. View at: Publisher Site | Google Scholar
  7. D. Bavelier, C. S. Green, D. H. Han, P. F. Renshaw, M. M. Merzenich, and D. A. Gentile, “Brains on video games,” Nature Reviews Neuroscience, vol. 12, no. 12, pp. X763–X768, 2011. View at: Publisher Site | Google Scholar
  8. D. H. Han, N. Bolo, M. A. Daniels, L. Arenella, I. K. Lyoo, and P. F. Renshaw, “Brain activity and desire for Internet video game play,” Comprehensive Psychiatry, vol. 52, no. 1, pp. 88–95, 2011. View at: Publisher Site | Google Scholar
  9. C.-H. Ko, J.-Y. Yen, S.-H. Chen, P.-W. Wang, C.-S. Chenb, and C.-F. Yen, “Evaluation of the diagnostic criteria of Internet gaming disorder in the DSM-5 among young adults in Taiwan,” Journal of Psychiatric Research, vol. 53, pp. 103–110, 2014. View at: Publisher Site | Google Scholar
  10. H. Cho, M. Kwon, J.-H. Choi et al., “Development of the internet addiction scale based on the internet gaming disorder criteria suggested in DSM-5,” Addictive Behaviors, vol. 39, no. 9, pp. 1361–1366, 2014. View at: Publisher Site | Google Scholar
  11. D. J. Kuss, “Internet gaming addiction: current perspectives,” Psychology Research and Behavior Management, vol. 6, pp. 125–137, 2013. View at: Google Scholar
  12. V. Anand, “A study of time management: the correlation between video game usage and academic performance markers,” Cyberpsychology and Behavior, vol. 10, no. 4, pp. 552–559, 2007. View at: Publisher Site | Google Scholar
  13. S. Achab, M. Nicolier, F. Mauny et al., “Massively multiplayer online role-playing games: comparing characteristics of addict vs non-addict online recruited gamers in a French adult population,” BMC Psychiatry, vol. 11, article 144, 2011. View at: Publisher Site | Google Scholar
  14. R. Festl, M. Scharkow, and T. Quandt, “Problematic computer game use among adolescents, younger and older adults,” Addiction, vol. 108, no. 3, pp. 592–599, 2013. View at: Publisher Site | Google Scholar
  15. M. C. Haagsma, M. E. Pieterse, and O. Peters, “The prevalence of problematic video gamers in the netherlands,” Cyberpsychology, Behavior, and Social Networking, vol. 15, no. 3, pp. 162–168, 2012. View at: Publisher Site | Google Scholar
  16. R. A. Mentzoni, G. S. Brunborg, H. Molde et al., “Problematic video game use: Estimated prevalence and associations with mental and physical health,” Cyberpsychology, Behavior, and Social Networking, vol. 14, no. 10, pp. 591–596, 2011. View at: Publisher Site | Google Scholar
  17. APA, Diagnostic and Statistical Manual of Mental Disorders: Text Revision, American Psychiatric Association, Washington, DC, USA, 4th edition, 2000.
  18. D. L. King, M. C. Haagsma, P. H. Delfabbro, M. Gradisar, and M. D. Griffiths, “Toward a consensus definition of pathological video-gaming: a systematic review of psychometric assessment tools,” Clinical Psychology Review, vol. 33, no. 3, pp. 331–342, 2013. View at: Publisher Site | Google Scholar
  19. M. D. Griffiths, “Non-addictive psychoactive drug use: implications for behavioral addiction,” Behavioral and Brain Sciences, vol. 34, no. 6, pp. 315–316, 2011. View at: Publisher Site | Google Scholar
  20. M. D. Griffiths and A. Meredith, “Videogame addiction and its treatment,” Journal of Contemporary Psychotherapy, vol. 39, no. 4, pp. 247–253, 2009. View at: Publisher Site | Google Scholar
  21. J. E. Grant and S. R. Chamberlain, “Gambling disorder and its relationship with substance use disorders: Implications for nosological revisions and treatment,” The American Journal on Addictions, 2013. View at: Publisher Site | Google Scholar
  22. A. Johansson, J. E. Grant, S. W. Kim, B. L. Odlaug, and K. G. Götestam, “Risk factors for problematic gambling: a critical literature review,” Journal of Gambling Studies, vol. 25, no. 1, pp. 67–92, 2009. View at: Publisher Site | Google Scholar
  23. R. C. Kessler, I. Hwang, R. Labrie et al., “DSM-IV pathological gambling in the National Comorbidity Survey Replication,” Psychological Medicine, vol. 38, no. 9, pp. 1351–1360, 2008. View at: Publisher Site | Google Scholar
  24. E. M. Álvarez-Moya, S. Jiménez-Murcia, R. Granero et al., “Comparison of personality risk factors in bulimia nervosa and pathological gambling,” Comprehensive Psychiatry, vol. 48, no. 5, pp. 452–457, 2007. View at: Publisher Site | Google Scholar
  25. L. Janiri, G. Martinotti, T. Dario, F. Schifano, and P. Bria, “The gamblers' temperament and character inventory (TCI) personality profile,” Substance Use & Misuse, vol. 42, no. 6, pp. 975–984, 2007. View at: Publisher Site | Google Scholar
  26. D. T. Barry, E. A. Stefanovics, R. A. Desai, and M. N. Potenza, “Differences in the associations between gambling problem severity and psychiatric disorders among black and white adults: findings from the national epidemiologic survey on alcohol and related conditions,” American Journal on Addictions, vol. 20, no. 1, pp. 69–77, 2011. View at: Publisher Site | Google Scholar
  27. N. A. Dowling and M. Brown, “Commonalities in the psychological factors associated with problem gambling and internet dependence,” Cyberpsychology, Behavior, and Social Networking, vol. 13, no. 4, pp. 437–441, 2010. View at: Publisher Site | Google Scholar
  28. F. Tonioni, M. Mazza, G. Autullo et al., “Is Internet addiction a psychopathological condition distinct from pathological gambling?” Addictive Behaviors, vol. 39, no. 6, pp. 1052–1056, 2014. View at: Publisher Site | Google Scholar
  29. K. W. Muller, M. E. Beutel, B. Egloff, and K. Wölfling, “Investigating risk factors for internet gaming disorder: a comparison of patients with addictive gaming, pathological gamblers and healthy controls regarding the big five personality traits,” European Addiction Research, vol. 20, no. 3, pp. 129–136, 2014. View at: Publisher Site | Google Scholar
  30. R. Stinchfield, “Reliability, validity, and classification accuracy of a measure of DSM-IV diagnostic criteria for pathological gambling,” The American Journal of Psychiatry, vol. 160, no. 1, pp. 180–182, 2003. View at: Publisher Site | Google Scholar
  31. S. Jimenez-Murcia, R. Stinchfield, E. Alvarez-Moya et al., “Reliability, validity, and classification accuracy of a spanish translation of a measure of DSM-IV diagnostic criteria for pathological gambling,” Journal of Gambling Studies, vol. 25, no. 1, pp. 93–104, 2009. View at: Publisher Site | Google Scholar
  32. B. W. Brown and K. Russell, “Methods of correcting for multiple testing: operating characteristics,” Statistics in Medicine, vol. 16, no. 22, pp. 2511–2528, 1997. View at: Google Scholar
  33. H. R. Lesieur and S. B. Blume, “The south oaks gambling screen (SOGS): a new instrument for the identification of pathological gamblers,” The American Journal of Psychiatry, vol. 144, no. 9, pp. 1184–1188, 1987. View at: Google Scholar
  34. M. Chóliz and C. Marco, “Patrón de uso y dependencia de videojuegos en infancia y adolescencia,” Anales de Psicología, vol. 27, no. 2, pp. 418–426, 2011. View at: Google Scholar
  35. L. R. Derogatis, SCL-90-R: Cuestionario de 90 Síntomas: Manual, TEA Editorial, Madrid, Spain, 2002.
  36. C. R. Cloninger, The Temperament and Character Inventory—Revised, Center for Psychobiology of Personality, Washington University, St. Louis, Mo, USA, 1999.
  37. APA, Diagnostic and Statistical Manual of Mental Disorders (DSM-5), American Psychiatric Association, Washington, Wash, USA, 5th edition, 2013.
  38. APA, Diagnostic and Statistical Manual of Mental Disorders, American Psychiatric Association, Washington, DC, USA, 3rd edition, 1987.
  39. E. Echeburúa, C. Baéz, J. Fernández-Montalvo, and D. Páez, “Cuestionario de Juego Patológico de South Oaks (SOGS): validación española. [South Oaks Gambling Screen (SOGS): Spanish validation],” Analisis y Modificación de Conducta, vol. 20, no. 74, pp. 769–791, 1994. View at: Google Scholar
  40. R. Stinchfield, “Reliability, validity, and classification accuracy of the South Oaks Gambling Screen (SOGS),” Addictive Behaviors, vol. 27, no. 1, pp. 1–19, 2002. View at: Publisher Site | Google Scholar
  41. S. M. Alessi and N. M. Petry, “Pathological gambling severity is associated with impulsivity in a delay discounting procedure,” Behavioural Processes, vol. 64, no. 3, pp. 345–354, 2003. View at: Publisher Site | Google Scholar
  42. D. R. Strong, S. B. Daughters, C. W. Lejuez, and R. B. Breen, “Using the Rasch model to develop a revised gambling attitudes and beliefs scale (GABS) for use with male college student gamblers,” Substance Use and Misuse, vol. 39, no. 6, pp. 1013–1024, 2004. View at: Publisher Site | Google Scholar
  43. APA, Diagnostic and Statistical Manual of Mental Disorders (DSM-IV), American Psychiatric Association, Washington, DC, USA, 4th edition, 1994.
  44. C. R. Cloninger, D. M. Svrakic, and T. R. Przybeck, “A psychobiological model of temperament and character,” Archives of General Psychiatry, vol. 50, no. 12, pp. 975–990, 1993. View at: Publisher Site | Google Scholar
  45. F. Gutiérrez, N. Torrens, T. Boget et al., “Psychometric properties of the Temperament and Character Inventory (TCI) questionnaire in a Spanish psychiatric population,” Acta Psychiatrica Scandinavica, vol. 103, no. 2, pp. 143–147, 2001. View at: Publisher Site | Google Scholar
  46. J. A. Gutiérrez-Zotes, C. Bayón, C. Montserrat et al., “Temperament and Character Inventory Revised (TCI-R). Standardization and normative data in a general population sample,” Actas Espanolas de Psiquiatria, vol. 32, no. 1, pp. 8–15, 2004. View at: Google Scholar
  47. O. Martínez-Azumendi, C. Fernández-Gómez, and M. Beitia-Fernández, “Factorial variance of the SCL-90-R in a Spanish out-patient psychiatric sample,” Actas Espanolas de Psiquiatria, vol. 29, no. 2, pp. 95–102, 2001. View at: Google Scholar
  48. S. Jiménez-Murcia, E. M. Álvarez-Moya, R. Granero et al., “Cognitive-behavioral group treatment for pathological gambling: analysis of effectiveness and predictors of therapy outcome,” Psychotherapy Research, vol. 17, no. 5, pp. 544–552, 2007. View at: Publisher Site | Google Scholar
  49. R. B. Kline, Principles and Practice of Structural Equation Modeling, Guilford Press, New York, NY, USA, 3rd edition, 2010.
  50. P. M. Bentler and T. Raykov, “On measures of explained variance in nonrecursive structural equation models,” Journal of Applied Psychology, vol. 85, no. 1, pp. 125–131, 2000. View at: Publisher Site | Google Scholar
  51. K. Dunn, P. Delfabbro, and P. Harvey, “A preliminary, qualitative exploration of the influences associated with drop-out from cognitive-behavioural therapy for problem gambling: an Australian perspective,” Journal of Gambling Studies, vol. 28, no. 2, pp. 253–272, 2012. View at: Publisher Site | Google Scholar
  52. B. Walther, M. Morgenstern, and R. Hanewinkel, “Co-occurrence of addictive behaviours: personality factors related to substance use, gambling and computer gaming,” European Addiction Research, vol. 18, no. 4, pp. 167–174, 2012. View at: Publisher Site | Google Scholar
  53. D. J. Kuss, M. D. Griffiths, L. Karila, and J. Billieux, “Internet addiction: a systematic review of epidemiological research for the last decade,” Current Pharmaceutical Design, vol. 20, no. 25, pp. 4026–4052, 2014. View at: Google Scholar
  54. D. L. King and P. H. Delfabbro, “Internet gaming disorder treatment: a review of definitions of diagnosis and treatment outcome,” Journal of Clinical Psychology, 2014. View at: Publisher Site | Google Scholar
  55. M. Mehroof and M. D. Griffiths, “Online gaming addiction: the role of sensation seeking, self-control, neuroticism, aggression, state anxiety, and trait anxiety,” Cyberpsychology, Behavior, and Social Networking, vol. 13, no. 3, pp. 313–316, 2010. View at: Publisher Site | Google Scholar

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