Lubke, G.H.

singleton study adhd symptoms children problem trajectorie attention problems class child attention symptom psychiatry model sample assessment level childhood \0.001 teacher difference 12 years identi fied adolesc disorder fi ndings development intercept score trajectory psychol high-decreasing verhulst ap scores rating hyperactivity netherland number variance result population ficit hyperactivity disorder hudziak jj university factor slope scale behavior growth dutch identi zuid-holland study teacher ratings family low-increasing adolescent psychiatry mother-rated attention problems department information adolescent boomsma dutch children class proportions nding bic differences high-decreasing trajectory mixture adolescence value zuid-holland survey analyses speci response report proportion group signi sample teacher data koot hm fi nancial constraints