Table 3.
ZINB Primary Model Results: Effect of Anticipated 21st Birthday eBAC, Drinks per Week, and Intervention Condition on 21st Birthday Alcohol Involvement
| Count Portion of Model | Logistic Portion of Model | |||||
|---|---|---|---|---|---|---|
|
| ||||||
| Outcome=21st Birthday eBAC | ||||||
| B | SE B | Z | B | SE B | Z | |
| Intercept | 2.340 | .058 | 40.604*** | −1.718 | .282 | −6.104*** |
| Main Effects | ||||||
| Anticipated 21 Birthday eBAC | 3.578 | .575 | 6.211*** | 1.555 | 2.321 | .670 |
| Drinks per Week | .017 | .005 | 3.149** | −.064 | .043 | −1.482 |
| Intervention Conditiona | −.180 | .111 | −.162 | −.534 | .431 | −1.240 |
| Two-Way Interactions | ||||||
| Anticipated 21st Birthday eBAC by Drinks per Week | −.124 | .036 | −3.419** | −.426 | .561 | −.758 |
| Anticipated 21st Birthday eBAC by Condition | .798 | 1.124 | .710 | −1.051 | 4.237 | −.248 |
| Drinks per Week by Condition | −.010 | .012 | −.876 | −.003 | .094 | −.031 |
| Three-Way Interaction | ||||||
| Anticipated 21st Birthday eBAC by Drinks per Week by Condition | .340 | .145 | 2.341* | −.575 | 4.797 | −.120 |
|
| ||||||
| Outcome=21st Birthday Problems | ||||||
| Intercept | .988 | .147 | 6.708*** | −2.380 | 2.472 | −.963 |
| Main Effects | ||||||
| Anticipated 21 Birthday eBAC | .517 | .674 | .767 | −9.086 | 22.441 | −.405 |
| Drinks per Week | .015 | .008 | 1.965 | −.168 | .128 | −1.312 |
| Intervention Conditiona | −.193 | .207 | −.936 | −.058 | 1.287 | −.045 |
| Two-Way Interactions | ||||||
| Anticipated 21st Birthday eBAC by Drinks per Week | −.156 | .042 | −3.693*** | −.312 | .490 | −.636 |
| Anticipated 21st Birthday eBAC by Condition | .635 | 1.203 | .528 | 23.820 | 17.538 | 1.358 |
| Drinks per Week by Condition | .004 | .012 | .358 | .026 | .305 | .084 |
| Three-Way Interaction | ||||||
| Anticipated 21st Birthday eBAC by Drinks per Week by Condition | −.070 | .116 | −.602 | −1.394 | 0.966 | −1.444 |
Note. Results from two separate models are presented, one with 21st birthday eBAC as the outcome (top panel), and one with 21st birthday problems as the outcome (bottom panel). B values represent unstandardized coefficients. ZINB=Zero-Inflated Negative Binomial. eBAC=estimated Blood Alcohol Content. Lowest.
p<.025, two-tailed
p<.01, two-tailed
p<.001, two-tailed.
Coded as 0=Control, 1=intervention.
The model with the three-way interaction and AIC and BIC values of 5446 and 5604, respectively. The model with the two-way interaction had AIC and BIC values of 5182 and 5311, respectively. The model with the main effects had AIC and BIC values s3402 and 3468, respectivel