The Choice of Screening Instrument Matters: The Case of Problematic Cannabis Use Screening in Spanish Population of Adolescents
Table 2
Associations of different combinations of being positive on the studied instruments with key demographic, substance use, and drug-related problems variables. Distributions and means.
All last year cannabis users with computable total scores
Negative on all three instruments
Positive only on CAST
Positive only on SDS
Positive on CAST and SDS
Positive only on DSM-IV abuse
Positive on DSM-IV abuse and CAST
Positive on DSM-IV abuse and SDS
Positive on all three instruments
()
()
()
()
()
()
()
()
()
Years since first cannabis use (mean (SD))
1.65 (1.43)
1.30 (1.25)
2.07 (1.40)
1.27 (1.10)
1.93 (1.50)
1.57 (1.39)
2.31 (1.55)
1.91 (1.44)
2.51 (1.71)
Percent of girls
51.4%
57.60%
46.70%
57.10%
57.80%
45.00%
39.50%
35.90%
38.50%
Two or more days of truancy in the past month (total )o
11.7% (3090)
7.30% (1615)
15.00% (381)
5.60% (126)
8.40% (95)
14.80% (277)
20.10% (329)
14.30% (28)
25.10% (239)
Use of cannabis 10 days or more in the past month
18.6%
27.80%
38.00%
2.90%
38.80%
9.40%
41.90%
23.10%
55.60%
Last year cannabis use 1 to 3 days
34.60%
49.10%
12.60%
55.7%
13.80%
36.50%
8.30%
15.40%
10.20%
Last year cannabis use 40 days or more
22.70%
6.90%
41.30%
6.4%
44.00%
17.90%
51.70%
23.10%
61.80%
Two or more days of alcohol bingeing in the past month
48.4%
40.20%
55.70%
40.70%
51.70%
52.20%
63.50%
53.80%
67.30%
Majority or all friends consume cannabis (total )a
40.9% (3491)
27.30% (1799)
56.70% (443)
28.10% (139)
56.1% (114)
38.50% (314)
64.20% (371)
59.00% (39)
73.50% (272)
Suffered an accident requiring medical help within six hours of cannabis use in the last twelve months
5.6%
1.20%
7.60%
1.40%
7.80%
4.10%
16.0%
10.30%
19.30%
Detained by police within six hours of cannabis use in the last twelve months
5.8%
1.00%
6.10%
2.10%
6.00%
5.00%
15.20%
7.70%
26.90%
Thinking that habitual cannabis use causes “quite some problems” or “a lot of problems” (total n)a
75.6% (3293)
83.20% (1700)
62.10% (412)
89.70% (126)
67.30% (107)
79.40% (296)
60.00% (360)
73.00% (37)
61.60% (255)
Smoked tobacco some days per week or more often in the past 30 days
61.10%
51.00%
73.50%
55.00%
75.90%
58.50%
80.30%
56.40%
81.10%
Going out one or more nights per week
68.5%
64.20%
76.40%
60.00%
71.60%
65.40%
76.50%
56.40%
81.50%
Aged 14-15
33.6%
34.20%
24.50%
47.90%
31.9%
38.70%
32.8%
33.30%
33.5%
Aged 16
28.1%
29.40%
27.90%
25.70%
25.00%
24.8%
26.4%
38.50%
26.5%
Aged 17-18
38.3%
36.30%
47.60%
26.40%
43.10%
36.5%
40.8%
28.20%
40.00%
Notes: alcohol bingeing was defined as drinking five or more glasses of alcohol at one single occasion. aThe total in case of these variables is different, because answer category “I don't know” was treated in the analysis as a missing value (only valid percentages are reported). oThe total in case of this variable is different, because other reasons of not attending class were excluded from the analysis and only valid percentage is reported.
