An epidemiologic survey of twins in a large, prospectively studied population.
D000293:Adolescent; D000328:Adult; D000013:Congenital Abnormalities / Q000401:mortality; D004200:Diseases in Twins; D005006:Ethnicity; D005260:Female; D005313:Fetal Death; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000401:mortality; D008297:Male; D008423:Maternal Age; D011247:Pregnancy; D011446:Prospective Studies; D012127:Respiratory Distress Syndrome, Newborn / Q000401:mortality; D012744:Sex Ratio; D012959:Socioeconomic Factors; D014427:Twins