A A Levin,
S C Schoenbaum,
P G Stubblefield,
S Zimicki,
R R Monson and
K J Ryan
We compared the prior pregnancy histories of 85 multigravidwomen with an ectopic pregnancy and 498 multigravid deliverycomparison subjects. We found a relationship between the numberof prior induced abortions and the risk of ectopic pregnancy:the crude relative risk of ectopic pregnancy was 1.6 for womenwith one prior induced abortion and 4.0 for women with two ormore prior induced abortions; however, use of multivariate techniquesto control confounding factors reduced the relative risks to1.3 (95 per cent confidence interval, 0.6-2.7) and 2.6 (95 percent confidence interval, 0.9-7.4), respectively. The analysissuggests that induced abortion may be one of several risk factorsfor ectopic pregnancy, particularly for women who have had abortionsplus pelvic inflammatory disease or multiple abortions.
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