With respect to the covariates included in the model, the relationship between pre-intervention aggression levels and age of first use was not statistically significant (est.=.0.083, S.E.=.073, p=.256). Additionally, gender was not a significant predictor (est.=−0.134, S.E.=0.161, p=.404). The population stratification variable was a significant predictor of age of first marijuana use (est.=3.652, S.E.=1.473, p=.013). For regression estimates of all covariates, please see Table 2.
