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The following factors were found significantly more often in cases of ectopic pregnancy: a history of earlier ectopic pregnancy, a history of salpingitis, a history of earlier operation on the Fallopian tubes, a history of infertility, and a pregnancy that had occurred in spite of an intra\u2010uterine contraceptive device. A history of appendectomy was also found significantly more often among the cases. There was no significant correlation between ectopic pregnancy and a history of no earlier pregnancy, earlier deliveries, earlier spontaneous or induced abortions or a history of other gynecological operations and increased risk of ectopic pregnancy. One or more of the risk factors were found in 76.5% of cases and 23% of controls.<\/jats:p>","DOI":"10.3109\/00016349109007919","type":"journal-article","created":{"date-parts":[[2007,11,13]],"date-time":"2007-11-13T19:08:42Z","timestamp":1194980922000},"page":"575-579","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Risk Factors in Ectopic Pregnancy Results of A Population\u2010Based Case\u2010Control Study"],"prefix":"10.1111","volume":"70","author":[{"given":"Fredrik","family":"Nordenskj\u00f6ld","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mats","family":"Ahlgren","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,1,7]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.282.6257.15"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.294.6574.740"},{"key":"e_1_2_1_4_1","first-page":"289","article-title":"Ectopic pregnancy, United States, 1981\u20131983","volume":"35","author":"Centers for Disease Control","year":"1986","journal-title":"MMWR"},{"key":"e_1_2_1_5_1","volume-title":"Ectopic pregnancy, clinical features, risk factors and fertility prognosis","author":"Thorburn Olsson J.","year":"1987"},{"key":"e_1_2_1_6_1","first-page":"386","article-title":"Ectopic pregnancy mortality, United States, 1979\u20131980","volume":"64","author":"Dorfman S F.","year":"1984","journal-title":"Obstet Gynecol"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0015-0282(16)59824-0"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0015-0282(16)48559-6"},{"key":"e_1_2_1_9_1","first-page":"515","article-title":"Simple interval\u2010estimation of risk ratio","volume":"10","author":"Miettinen O S.","year":"1974","journal-title":"Am J Epidemiol"},{"key":"e_1_2_1_10_1","first-page":"21","article-title":"Increase of ectopic pregnancy in Finland. 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