2 45 The effectiveness of Take it Personal! on substance use Table 1 Adolescent’s demographics and outcome characteristics. Total sample Intervention Control t /χ2 df p Demographics Age (M, SD) 17.45 (2.76) 17.21 (2.67) 17.72 (2.88) -0.75 64 0.455 Total IQ (M, SD) 73.68 (7.92) 72.39 (9.13) 74.85 (6.91) 0.94 30.86 0.329 Gender (n male, %) 47 (71%) 20 (59%) 27 (84%) 3.20 1 0.043* Outcomes Baseline alcohol use frequency (M, SD) 2.71 (1.06) 2.92 (1.14) 2.50 (0.95) 1.59 64 0.117 Follow-up alcohol use frequency (M, SD) 2.41 (0.72) 2.31 (0.69) 2.52 (0.75) 1.23 64 0.225 Baseline cannabis use frequency (M, SD) 2.98 (1.52) 3.26 (1.52) 2.69 (1.49) 1.55 64 0.125 Follow-up cannabis use frequency (M, SD) 2.51 (1.06) 2.34 (0.95) 2.69 (1.15) 1.32 64 0.191 Baseline other drug use frequency (M, SD) 1.97 (1.64) 2.17 (1.78) 1.75 (1.48) 1.05 64 0.296 Follow-up other drug use frequency (M, SD) 1.82 (0.92) 1.66 (0.87) 1.98 (0.96) 1.46 64 0.148 Baseline substance use frequency+± (M, SD) 3.58 (1.10) 3.82 (1.05) 3.31 (1.09) 2.16 64 0.058 Follow-up substance use frequency+± (M, SD) 2.59 (0.90) 2.42 (0.91) 2.78 (0.86) 1.68 64 0.097 Baseline alcohol use severity (M, SD) 8.12 (6.12) 10.02 (6.72) 6.09 (4.72) 2.74 64 0.008** Follow-up alcohol use severity (M, SD) 6.27 (3.76) 6.74 (4.20) 5.78 (3.21) -1.03 64 0.306 Baseline drug use severity (M, SD) 10.83 (9.44) 12.02 (10.33) 9.56 (8.35) 1.06 64 0.292 Follow-up drug use severity (M, SD) 7.63 (5.95) 7.80 (6.01) 7.45 (5.97) -0.24 64 0.813 Baseline substance use severity+± (M, SD) 13.32 (8.22) 15.24 (8.63) 11.28 (7.35) 2.13 64 0.050 Follow-up substance use severity+± (M, SD) 8.43 (5.39) 7.52 (5.39) 7.99 (5.37) -0.68 64 0.498 Baseline binge drinking+ (M, SD) 2.02 (0.92) 2.32 (1.06) 1.67 (0.60) 3.02 52.24 0.004** Follow-up binge drinking+ (M, SD) 1.77 (0.62) 1.67 (0.56) 1.86 (0.68) 1.22 64 0.226 Note. * p< .05. ** p< .01. Total sample n = 66, intervention group n = 34, control condition n = 32. + The three primary outcome variables. ± The frequency/ severity of each adolescent’s most frequently/severely used substance at baseline. Outcomes on frequency and binge drinking are group averages on a 5-point Likert scale with (1) ‘never’, (2) ‘less than once a month’, (3) ‘every month’, (4) ‘every week’, (5) ‘almost every day’. Severity scores reflect the group average of AUDIT and DUDIT which is a sum-score of 10 items with this 5-point Likert scale. Follow-up are based on (in part) imputed data at 3-months post intervention.
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