Research Article

The Temporal Relationship between Selected Mental Disorders and Substance-Related Disorders: A Nationwide Population-Based Cohort Study

Table 1

The distribution of sociodemographic characteristics between mental illness and control cohorts and of the mental illness at baseline.

 Mental IllnessControl-value
(N=124,423)(N=124,423)
N (%)N (%)

Disease category
 Neurotic disorders114,114(91.71%)
 Affective psychoses21,754(17.48%)
 Adjustment reaction6,133(4.93%)
 Schizophrenia3,297(2.65%)
 Personality disorders1,710(1.37%)
Age (years)48.84(17.10)48.78(17.11)0.436
 10-194964(3.99%)5161(4.15%)0.548
 20-2914632(11.76%)14517(11.67%)
 30-3920091(16.15%)20106(16.16%)
 40-4926809(21.55%)26899(21.62%)
 50-5923298(18.72%)23158(18.61%)
 60-6918124(14.57%)18135(14.58%)
 ≥7016505(13.27%)16447(13.22%)
Gender0.708
 Male48529(39.00%)48438(38.93%)
 Female75894(61.00%)75985(61.07%)
Urban level1.000
 Highest urbanization28284(22.73%)28281(22.73%)
 High urbanization34946(28.09%)34943(28.08%)
 Moderate21999(17.68%)22002(17.68%)
 Low urbanization21939(17.63%)21931(17.63%)
 Lowest urbanization17255(13.87%)17266(13.88%)
Income level (NT$)1.000
 ≦18,78061421(49.36%)61418(49.36%)
 18,780-22,80033219(26.70%)33209(26.69%)
 22,801-28,8007347(5.90%)7339(5.90%)
 28,801-36,3007723(6.21%)7719(6.20%)
 36,301-45,8007583(6.09%)7576(6.09%)
 ≧45,8007130(5.73%)7162(5.76%)

: the denominator for each of the selected MI is 124,423; denotes the value for testing the mean difference on age variable between two groups.