Although gender and body weight were used as covariates in the regression model, only gender significantly contributed to both quantity and drinks per drinking day (see Table 3). Gender was a significant predictor of drinks per drinking day during the period of earliest drinking, and also a significant predictor of quantity of alcohol drinks for earliest, regular, and heaviest drinking. Body weight had no effect on quantity of alcohol and drinks per drinking day when loaded with other covariates, despite differences in body weight between genders.