Percentage of children who do and do not meet DSM-IV criteria for ADHD at age 6 years as a function of combination of informants with BL ratings ≥ 90th %ile: P+T+C > 0 or 1, χ2 (1) = 11.69, p = .004; P+T > 0 or 1, χ2 (1) = 8.62, p = .018; P+C > 0 or 1, χ2 (1) = 5.45, p = .04; C+T = 0 or 1, χ2 (1) =.05, p = 1.00 [all p values adjusted for multiple testing using Bonferroni Step-Down correction (Holm, 1979)]
Note: C = clinician rating; P = parent rating; T = teacher rating