Table 3.
Changes in substance use outcomes from Time 1 to Time 2
| Substance use |
Time 1 Mean (SD)/N (%) |
Time 2 Mean (SD)/N (%) |
t (df)/ X2 (df) | p-value |
|---|---|---|---|---|
| Alcohol use days (past 30 days) | 11.37 (5.21) | 8.82 (6.05) | 12.32 (1024) | < 0.001 |
| Binge drinking days (past 30 days) | 5.09 (3.61) | 3.39 (3.14) | 15.27 (1024) | < 0.001 |
| Average drinks per occasion (past 30 days)a | 5.59 (2.56) | 4.32 (2.20) | 14.23 (977) | < 0.001 |
| Max drinks on one occasion (past 30 days)a | 7.77 (2.84) | 5.88 (2.11) | 20.54 (977) | < 0.001 |
| Any cannabis use (lifetime) | 200 (19.5%) | 314 (30.7%) | 220.59 (1, 1024) | < 0.001 |
| Cannabis use days among full sample (past 30 days) | 1.12 (3.74) | 1.23 (3.81) | 0.99 (1024) | 0.323 |
| Cannabis use days among lifetime users (past 30 days)b | 3.67 (6.04) | 4.02 (6.01) | 0.98 (313) | 0.322 |
Note: aAmong past 30-day drinkers only. bAmong lifetime cannabis users only