Results of weighted logistic regressions for smoking, drinking and marijuana use are presented in Tables 3 to 5. These logistic regression analyses showed that father communication was not protective against smoking by either sons or daughters. Mother communication was protective against smoking by sons (OR=0.61, 95% CI=0.38–0.98) but not by daughters. Father communication and mother communication were not protective against alcohol drinking. Father communication was protective against marijuana use by sons (OR=0.38, 95% CI=0.24–0.62) but not daughters.