Table 4.

Prevalence of ADHD Based on Different Case Definitions, South Carolina Replication Sample of the Project to Learn About Youth Mental Health (SC Re-PLAY).

ADHD case definition	Unweighted n	Weighted prevalence* [95% CI]
Parent-reported diagnosis
Parent-reported ever diagnosis	160	24.1 [18.8, 30.0]
Parent-reported current diagnosis	158	23.5 [18.3, 29.4]
Parent- and teacher-DSM-based criteria (DISC-IV and SDQ and/or BASC-2 BESS)†
Diagnosis based on parent- and teacher-reported DSM-based criteria§	70	8.1 [5.4, 11.7]
Criterion A. Parent-reported DISC-IV criteria met	104	13.5 [10.1, 17.4]
Criterion B. Parent reported three to five symptoms¶ with at least one symptom causing severe impairment or two symptoms causing moderate impairment	169	24.7 [20.2, 29.5]
Criterion C. Parent reported three or more symptoms¶ with at least one symptom causing mild impairment	217	31.5 [26.6, 36.7]
Criterion D. Parent reported three or more symptoms¶ without impairment	312	44.5 [38.8, 50.3]

Note. CI = confidence interval; DISC-IV = diagnostic interview schedule for children—version IV; SDQ = Strengths and Difficulties Questionnaire; BASC-2 BESS = Behavior Assessment System for Children—Second Edition, Behavioral and Emotional Screening System.

^*Unweighted denominator = 561 children

^†Criteria are not mutually exclusive.

^§ADHD case definition for the study.

^¶Symptoms include DISC-IV symptoms of inattention or hyperactivity/impulsivity (six required to meet full diagnostic criteria).