Gender differences in symptoms manifestation of inattention, hyperactive-impulsive and combined type of ADHD were also examined, also if boys are overdiagnosed and if girls are underdiagnosed.
Kynjamunur á birtingamynd einkenna á athyglisbrests- og ofvirkni-hvatvísis-og blandaðari gerð ADHD var einnig skoðaður, og hvort strákar séu ofgreindir, stelpur séu vangreindar.