Suggestive of possible indirect effects, impulsivity and family history were both significant predictors of AO (p < 0.001; p = 0.004), and AO significantly predicted the intercept. Furthermore, Sobel tests indicated that the indirect effects of family history (z = 3.86, p < 0.001) and impulsivity (z = 2.86, p < 0.01) on the intercept for heavy drinking were statistically significant. Thus, a positive family history and high levels of impulsivity contributed to heavier drinking, in part, through an earlier AO.
