Final latent difference model with covariates, primary predictors, and interactions between friendship quality and proximal friend behavior (i.e., responsiveness) predicting latent constructs for baseline cortisol, cortisol reactivity, and cortisol recovery. All predictors were allowed to correlate with one another, as were the latent cortisol constructs. aIn this reduced model, depressive symptoms were only allowed to predict baseline cortisol. bResponsiveness was only allowed to predict cortisol recovery.