Among the demographic and clinical characteristics, only lower IQ (χ2=4.67; P=.03; hazard ratio [HR]=0.97; 95% confidence interval [CI], 0.95-0.998; heavy drinking relapse: χ2=5.22; P=.02; HR=0.97; 95% CI, 0.95-0.996), higher days of other drug use at baseline (time to relapse: χ2=4.01; P=.05; HR=1.01; 95% CI, 1.001-1.02), and female sex (heavy drinking relapse: χ2=6.33; P=.01; HR=0.51; 95% CI, 0.31-0.86) were predictive of shorter time to alcohol relapse. Other clinical history variables, such as lifetime prevalence of mood and anxiety disorders, were not predictive of alcohol relapse. These significant predictors were included as covariates for the time to alcohol relapse and time to heavy drinking relapse analyses whenever each contributed significantly to the respective proportional hazards model.
