title: First national survey on morbidity in Singapore, 1976/1977.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004493:Education; D005006:Ethnicity; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D009017:Morbidity; D012737:Sex Factors; D012846:Singapore; D012959:Socioeconomic Factors