main effect (HR=1.27, CI:1.01–1.60) and an interaction with race were observed for single–paren-household status (HR=0.73, CI:0.54–0.99) (see Supplemental Figure 1), indicating that living in a single-parent household is associated with elevated likelihood of initiating alcohol use exclusively in White girls. We also found a significant interaction between childhood trauma and primary caregiver education level <12 years (HR=1.44, CI:1.02–2.03) (see Supplemental Figure 2), indicating that girls whose primary caregivers have less than a high school level of education have an even greater likelihood of initiating alcohol use when exposed to childhood trauma.
