title: Play in pre-school centres--I. Play measures and their relation to age, sex and I.Q.
mesh_terms: D000367:Age Factors; D002657:Child Development; D002675:Child, Preschool; D003071:Cognition; D003299:Cooperative Behavior; D005260:Female; D006801:Humans; D007092:Imagination; D007360:Intelligence; D008297:Male; D010988:Play and Playthings; D012578:Schools, Nursery; D012737:Sex Factors; D012919:Social Behavior; D012934:Social Isolation; D013997:Time Factors; D014705:Verbal Behavior