Using the Parental HIV data consider performing a confirmatory data analysis investigating the relationship between the age at which children started drinking alcohol (if they have already started)...

Using the Parental HIV data consider performing a confirmatory data analysis investigating the relationship between the age at which children started drinking alcohol (if they have already started) and gender without running any analysis first. Consider what variables might (a priori) be a potential confounder, effect modifier or precision variable. Then fit the model that you selected (a priori).