title: Intellectual maturity of children: demographic and socioeconomic factors.
mesh_terms: D000375:Aging; D002648:Child; D005190:Family; D005260:Female; D006801:Humans; D007360:Intelligence; D007361:Intelligence Tests; D008297:Male; D044469:Racial Groups; D012424:Rural Population; D012737:Sex Factors; D012959:Socioeconomic Factors; D014481:United States; D014505:Urban Population