[Prevalence of selected impairments: United States-1977].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D006233:Persons with Disabilities; D005260:Female; D006306:Health Surveys; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D009017:Morbidity; D012737:Sex Factors; D012959:Socioeconomic Factors; D014481:United States