title: Subgroup models cannot tell the whole story when assessing relative age in attention deficit hyperactivity disorder.
authors.affiliation: OptiStatim, LLC, Longmeadow, Massachusetts.
authors.forename: Brian H
authors.initials: BH
authors.lastname: Nathanson
mesh_terms: D001289:Attention Deficit Disorder with Hyperactivity; D006801:Humans; D012720:Severity of Illness Index
keywords: Wald test; confidence intervals; statistics