Table 1.
Medians (SD) of sample characteristics and study measures in all participants at baseline (Complete sample), and for the participants that remained in the study at follow-up (Control and Experimental Group, excluding drop-out).
| Complete sample (n = 90) | Control (n = 36, excluding drop-out) | Experimental (n = 29, excluding drop-out) | |||
|---|---|---|---|---|---|
| Baseline | Baseline | Follow-up | Baseline | Follow-up | |
| Female (%) | 23 | 19 | 24 | ||
| Age (years) | 21.4 (18.3–28.3) | 20.9 (18.3–25.7) | 21.4 (18.3–28.3) | ||
| Cannabis use: | |||||
| Days per week | 6 (3–7) | 6 (3–7) | 6 (3-7) | ||
| TLFB, grams past week | 2.7 (0.7–16.8) | 4.3 (1.8–15.7) | 3.2 (0.3–11.8) | 5.2 (0.7–16.8) | 2.4 (0–10) |
| CUDIT-R | 17 (10–27) | 16 (10–26) | 17 (11–27) | ||
| Mixed joints with tobacco (%) | 91 | 89 | 90 | ||
| Alcohol use: | |||||
| TLFB, glasses past week | 10 (0–55.2) | 11 (0–51.5) | 12 (0–37) | 10 (0–55.2) | 4 (0–100) |
| AUDIT | 11.5 (0–28) | 11 (3–24) | 12 (0–28) | ||
| Smoking: | |||||
| Smokers (%) | 72 | 64 | 72 | ||
| TLFB, cigarettes past week | 42.5 (0–161) | 42 (0–160) | 32 (0–195) | 47 (0–161) | 42 (0–160) |
| FTND | 1 (0–7) | 0 (0–7) | 2 (0–7) | ||
| Depression (BDI) | 7 (0–30) | 5 (0–30) | 8 (2–26) | ||
| Cognitive factors: | |||||
| Cannabis craving (MCQ-SF) | 3.2 (1.5–5.5) | 3.2 (1.5–5.2) | 3.2 (1.7–5.5) | ||
| Stroop Interference score (ms) | 30.2 (11.7–54.1) | 27.5 (11.7–54.1) | 31.8 (13.8–52) | ||
| CCT n cards | 9.6 (2.7–15) | 8.5* (2.7–13.9) | 10* (5.8–15) | ||
| Cannabis withdrawal at follow-up (MWC) | – | – | 8* (0–21) | – | 11* (0–36) |
Range is reported between brackets. TLFB, Timeline Follow Back; CUDIT-R, Cannabis Use Disorder Identification Test-Revised; AUDIT, Alcohol Use Disorder Identification Test; BDI, Beck Depression Inventory; FTND, Fagerstrom Test for Nicotine Dependence; MCQ-SF, Marihuana Craving Questionnaire-Short Form; CCT, Columbia Card Task; MWC, Marihuana Withdrawal Checklist.
*
significant group differences at p < 0.05.