As depicted in Figure 1, MAOA-L was associated with increased inattention for children with low or moderate trauma exposure, and MAOA-H was associated with increased inattention for children with extreme histories of trauma. Approximately 20% of the cohort met diagnostic criteria for ADHD, with comparable rates for children in the low, moderate, severe, and extreme trauma exposure categories (Kendall’s tau-b = −.25, ns). In contrast, none of the children in the low to moderate trauma exposure range, 33% in the severe range, and 71% in the extreme trauma exposure range met diagnostic criteria for PTSD (Kendall’s tau-b = 11.6, p <.001). Children in the severe and extreme trauma exposure range were also more likely to meet criteria for MDD (Kendall’s tau-b = 2.6, p <.01) or any depressive diagnosis (Kendall’s tau-b = 2.4, p <.02). Elevated inattention scores were associated with each of these diagnoses: ADHD (F = 11.8, p < .001), PTSD (F = 4.4, p < .04), and depression (F = 3.4, P < .05).
