Association of induced abortion with subsequent pregnancy loss

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Abstract
Prior pregnancy histories of 2 groups of multigravidas-240 women having a pregnancy loss up to 28 wk gestation and 1072 women having a term delivery were compared. Women who had had 2 or more prior induced abortions had a 2-fold to 3-fold increase in risk of 1st trimester spontaneous abortion, loss between 14-19 and 20-27 wk. The increased risk was present for women who had legal induced abortions since 1973. It was not explained by smoking status, history of prior spontaneous loss, prior abortion method or degree of cervical dilatation. No increase in risk of pregnancy loss was detected among women with a single prior induced abortion. Multiple induced abortions apparently do increase the risk of subsequent pregnancy losses up to 28 wk gestation.

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