The phi coefficient is similar in its interpretation to the Pearson correlation coefficient, but it is a measure of l54l. To adjust correlation between two binary variables for covariates and to account for correlation between siblings(5013 unique families), we used generalized mixed models(Proc GLIMMIX) to model associations between family functioning and quality of mother an father-adolescent relationship and adolescent weight status and weight-related behaviors. We fit separate models for each of the outcome variables. All models adjusted for adolescent's and structure. We lso fit models that additionally adjusted for mothers BMI at age 18 years, adolescent living situation(with parents or other), and adolescent race/ethnicity, the effect estimate remained virtually unchanged(results not shown), so we report only estimates from the more parsimonious model. To provide a point of reference fo the odds ratio estimates, the predictive prevalence fo outcome variable