FIGURE 2.

Intergenerational (IG) continuity in early-onset cannabis as a function of parents’ age at child's birth. Note: Results of time-varying effect models (TVEM) for Hypothesis c. The top panel (a) presents the log odds coefficient of IG continuity, and the bottom panel (b) translates the log odds estimates from the TVEM to the predicted probabilities of child's early onset as a function of parent's age at child's birth among parents who did (dashed line) or did not (solid line) show early onset of cannabis use. Shaded areas in the top panel represent 95% confidence intervals. The reference line at 0 (dotted line) in the top panel signifies the location of a nonsignificant slope for the effect of parental early-onset cannabis use on child early-onset cannabis use (IG effect). The x-axis of both graphs represents parent's age at child's birth. All covariates are held at the mean in the cross-study sample.