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. 2013 Sep 24;8(9):e75575. doi: 10.1371/journal.pone.0075575

Figure 1. Proportion of psychiatric morbidity by ADHD severity.

Figure 1

Shown are the gradient for the prevalence of psychiatric morbidity by increasing levels of ADHD severity (strata I-IV). Design-based tests of linear trend for co-occurring clinical syndromes are the following: ASPD F = 113.8, Drug Dependence F = 99.2, Alcohol Dependence F = 128.1 and Anxiety disorders F = 466.8 (all P < 0.001).