Table 6 Correlation between baseline substance dependence and daily substance use at each follow-up visit in the eligible sample (n = 381)
All N (%) | SD-No N (%) | SD-Yes N (%) | p value | |
|---|---|---|---|---|
Daily substance use at baseline (n = 379)a | 110 (29) | 27 (17) | 83 (37) | <0.001 |
Daily substance use at 6-month visit (n = 346) | 93 (27) | 24 (17) | 69 (34) | <0.001 |
Daily substance use at 12-month visit (n = 357) | 106 (30) | 23 (16) | 83 (39) | <0.001 |
Daily substance use at 18-month visit (n = 341) | 89 (26) | 24 (17) | 65 (32) | 0.003 |
Daily substance use at 24-month visit (n = 319) | 75 (23) | 21 (16) | 54 (28) | 0.014 |