Free-play in nursery school children.
D000367:Age Factors; D001722:Birth Order; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007398:Interpersonal Relations; D008297:Male; D009043:Motor Activity; D009048:Motor Skills; D010988:Play and Playthings; D012929:Psychological Distance; D012578:Schools, Nursery; D012737:Sex Factors; D012919:Social Behavior