Attention-deficit/hyperactivity disorder: relations between prevalence rate and school district size, diagnostic method, and referral process.

To study whether prevalence rates of Attention-Deficit/Hyperactivity Disorder (ADHD) are related to size of school district, diagnostic method, and referral process, the ADHD Survey was mailed to all 311 superintendents of school districts in a midsouthern state; 128 (41.1%) were returned. Analysis showed no significant relationships; however, the low return rate suggests replication in other regions is necessary.