Table 2.
Mean ASSIST scores at baseline and follow-up by treatment arm using two-way repeated-measures analysis of variance (ANOVA)a
| Mean baseline scoreb | Mean follow-up scoreb | Mean effect size (% decrease) | Interaction effectc, P | |
|---|---|---|---|---|
| Total ASSIST Score | ||||
| BMI | 21.9 | 13.7 | 37.6 | F = 3.06, P = 0.081 |
| Usual care | 20.3 | 15.1 | 25.5 | |
| Alcohol ASSIST Score | ||||
| BMI | 13.0 | 8.0 | 38.3 | F = 4.79, P = 0.0293 |
| Usual care | 11.5 | 9.1 | 20.9 | |
| Cannabis ASSIST Score | ||||
| BMI | 6.4 | 4.6 | 28.3 | F = 2.54, P = 0.1119 |
| Usual care | 5.7 | 5.2 | 9.8 | |
| Methamphetamine ASSIST Score | ||||
| BMI | 1.5 | 0.7 | 57.2 | F = 1.47, P = 0.2264 |
| Usual care | 2.4 | 0.6 | 76.9 | |
Note: Bold P-values indicate differences that are statistically significant at P < 0.05.
aModels control for gender, race, religion and employment status.
bLeast square mean.
cInteraction of time and treatment arm in predicting a substance involvement score.