[Caries incidence among 3,000 primary school pupils in Li County, Aba District].
D000367:Age Factors; D002648:Child; D002681:China; D003731:Dental Caries / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D009910:Oral Hygiene; D012737:Sex Factors