Table 2.
Immediate and One-Month Follow-up Intervention Effects
| Control Group at Baseline Mean (SD) |
Control Group at Follow-up Mean (SD) |
Intervention Group at Baseline Mean (SD) |
Intervention Group at Follow-up Mean (SD) |
Intervention Effecta Coefficient(SE) |
|
|---|---|---|---|---|---|
| Immediate Changes in Perceptions of Peer Behavior | |||||
| Perceived drinks per week | 31.7 (21.4) | 26 (18.0) | 30.4 (20.6) | 14.3 (11.1) | −11.2 (0.9) *** |
| Perceived average drinks per occasion | 5.1 (3.0) | 4.3 (2.5) | 4.9 (2.9) | 3.1 (1.8) | −1.1 (0.1) *** |
|
| |||||
| Immediate Changes in Intentions to Drink Alcohol | |||||
| Intended total weekly drinks | 16.2 (17.0) | 15.5 (16.5) | 14.5 (16.0) | 11.3 (11.2) | −2.9 (0.6) *** |
| Intended average drinks | 3.6 (2.8) | 3.4 (2.6) | 3.5 (2.8) | 2.9 (2.2) | −0.4 (0.1) *** |
|
| |||||
| One-month Changes in Perceptions of Peer Behavior | |||||
| Perceived drinks per week | 31.7 (21.4) | 22.4 (16.7) | 30.4 (20.6) | 14.9 (12.6) | −7.1 (1.0) *** |
| Perceived average drinks per occasion | 5.1 (3.0) | 3.8 (2.4) | 4.9 (2.9) | 3.2 (2.1) | −0.6 (0.2) *** |
|
| |||||
| One-month Changes in Alcohol Use | |||||
| Drinks per week | 19.4 (18.4) | 13.4 (14.8) | 17.6 (16.9) | 9.9 (12.1) | −3.4 (0.9) *** |
| Average drinks per occasion | 4.2 (2.8) | 3.0 (2.4) | 4.1 (2.8) | 2.6 (2.1) | −0.4 (0.2) * |
| Number of binge drinking days | 6.4 (7.9) | 4.1 (6.1) | 5.4 (7.1) | 2.7 (4.8) | −1.0 (0.4) ** |
|
| |||||
| One-month Changes in Alcohol-related Consequences | |||||
| Number of alcohol-related consequences | 7.8 (6.7) | 5.3 (6.3) | 7.2 (6.8) | 3.8 (5.6) | −1.0 (0.4) ** |
Note:
**
p < .01,
***
p < .001;
a
intervention effect estimate reflects the regression coefficient for the intervention indicator from a weighted regression model controlling for age, gender, baseline drinking severity, device, and baseline measure of the outcome