title: Behaviour problems in the infant school: changes over two years.
mesh_terms: D000367:Age Factors; D000374:Aggression; D002648:Child; D002653:Child Behavior Disorders; D005260:Female; D006801:Humans; D008297:Male; D011159:Population Surveillance; D011569:Psychiatric Status Rating Scales; D012574:Schools; D012737:Sex Factors; D012918:Social Alienation; D012923:Social Class