Effect of age, parity, and cigarette smoking on outcome of pregnancy.
D000022:Abortion, Spontaneous / Q000453:epidemiology; D000328:Adult; D000367:Age Factors; D001724:Birth Weight; D000013:Congenital Abnormalities / Q000453:epidemiology; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D007746:Labor Presentation; D008875:Middle Aged; D010298:Parity; D011247:Pregnancy; D012744:Sex Ratio; D012907:Smoking