Based on the model results and the Wald test from PROC TRAJ, low-level P300 developmental trajectory group for 8–12 year olds was found to be significantly associated with high-risk status in male subjects. The high-risk male subjects in the 8–12 age range were 4.3 times more likely (p =0.021) to be found in the low-level P300 group compared to the mid-level P300 group; however, no association of group membership with risk status was evident in male subjects in the 13–18 or 19–29 age ranges. No association of group membership with familial risk status was found for female subjects in any of the three age ranges. Tabulations of trajectory group classifications as well as trajectory group compositions by risk status are summarized in Table 4, along with the number of subjects that were available for analysis in each age range.
