[Mental retardation and birth defects in a county of Jiangxi Province].
D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D002681:China; D000013:Congenital Abnormalities / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007223:Infant; D008607:Intellectual Disability / Q000453:epidemiology*; D007361:Intelligence Tests; D008297:Male; D012424:Rural Population