Induced abortion and spontaneous abortion: no connection?
The hypothesis that spontaneous abortion is associated with prior induced abortion is tested in an epidemiologic study. The reproductive histories of a consecutive series of women admitted to hospital with spontaneous abortions were compared with those of a control series of women who delivered after 28 weeks gestation. There is no association between spontaneous abortion and prior induced abortion. The power of the analysis to detect a 30% excess in the frequency of induced abortion in cases as compared to controls is 82% at alpha = .05. The design and analysis effectually controlled for all potentially confounding factors.
D000028:Abortion, Induced; D000022:Abortion, Spontaneous / Q000209:etiology*; D000293:Adolescent; D000328:Adult; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008423:Maternal Age; D009519:New York City; D011247:Pregnancy; D012306:Risk