Table 3.
Intervention group 12-month outcomes for the alcohol status/severity groups
| ALC+ Only (n = 44) | AUDIT+ Only (n = 44) | ALC+/AUDIT+ (n = 84) | |
|---|---|---|---|
| M(SD) or n(%) | M(SD) or n(%) | M(SD) or n(%) | |
| Alcohol use | |||
| MI | −0.63 (1.0) | −0.97 (1.6) | −0.16 (2.4) |
| FO | −0.20 (0.7) | 1.37 (2.9) | 0.35 (2.3) |
| Contrasts between treatment groups | F(1,41) = 3.19 | F(1,41) = 14.71*** | F(1,81) = 1.66 |
| Between treatment groups effect size | 0.52 | 1.05 | 0.21 |
| RAPI Total | |||
| MI | 24.39 (16.5) | 27.61 (21.5) | 26.84 (28.9) |
| FO | 23.10 (13.6) | 37.71 (20.7) | 25.50 (19.6) |
| Contrasts between treatment groups | F(1,36) = 0.03 | F(1,34) = 3.18 | F(1,71) = 0.08 |
| Between treatment groups effect size | −0.09 | 0.47 | −0.05 |
| Alcohol-related injury | |||
| MI | 3 (30.0%) | 10 (45.5%) | 18 (48.6%) |
| FO | 9 (31.0%) | 11 (78.6%) | 15 (41.7%) |
| Contrasts between treatment groups | χ2(1) = 0.00 | χ2(1) = 3.86* | χ2(1) = 0.36 |
| Between treatment groups effect size | 0.02 | 0.69 | −0.14 |
Note. ALC = Alcohol; reflects participants who were alcohol-positive by self-report or biochemical test. AUDIT = Alcohol Use Disorders Identification Test; reflects participants who scored 8 or higher on the AUDIT. BAC = Blood Alcohol Concentration. FO = Feedback Only intervention group. MI = Motivational Interview intervention group. RAPI = Rutgers Alcohol Problems Index. Alcohol use is the standardized composite of number of days drinking, number of heavy drinking days, and average number of drinks per week (all past month). Means are adjusted for baseline values. Effect sizes are Cohen’s d and use the pooled standard deviation. A positive effect size indicates MI had a better outcome than FO.
p < .05.
p < .001.