Exhibit 2.
Repeated Measures GEE Model for Emergency Department Visits during 24-Month Follow-Up among High-Risk College Drinkers
| Reduced Model (Blackouts Only) | Full Model (Covariates added) | |||||
|---|---|---|---|---|---|---|
| Covariate | RR | 95% CI | p-value | RR | 95% CI | p-value |
| Baseline blackouts | ||||||
| 1-2 blackouts | 1.21 | 1.06-1.37 | .004 | 1.09 | 0.94-1.27 | .242 |
| 3-5 blackouts | 1.66 | 1.34-1.90 | <.001 | 1.39 | 1.12-1.71 | .002 |
| 6+ blackouts | 1.96 | 1.48-2.50 | <.001 | 1.75 | 1.31-2.36 | <.001 |
| Experimental group | 1.21 | 0.91-1.60 | .189 | |||
| Prior injury at baseline | 1.27 | 0.89-1.80 | .185 | |||
| Age 18 to 20 | 1.39 | 0.96-2.00 | .078 | |||
| Age 21 to 23 | 1.08 | 0.71-1.62 | .727 | |||
| Male | 1.23 | 0.88-1.73 | .225 | |||
| Non-hispanic white | 1.30 | 0.84-2.01 | .238 | |||
| Sensation seeking | 1.03 | 0.81-1.31 | .801 | |||
| Weight, per 10 lbs | 1.00 | 0.95-1.04 | .847 | |||
| Baseline drinks, per 10 drinks | 0.97 | 0.91-1.04 | .433 | |||
| Baseline heavy drinking days | 1.03 | 0.97-1.11 | .317 | |||
SOURCE: Authors’ analysis. NOTES: RR=Relative Risk of Emergency Department visit compared to no blackout group. The reference group for the baseline blackout categories is no blackouts at baseline. The reference category for comparison in the full model is control group status, no alcohol injury at baseline, age 24 or more, female, African American or other race category, and non-freshman.