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Table 1 Risk factors for interstitial pregnancies

From: The diagnosis and management of interstitial ectopic pregnancies: a review

Risk factors Percentage of women with an IP who have this risk factor
Previous ectopic pregnancy 22.9–54%
Previous ipsilateral or bilateral salpingectomy 22.9–54%
Conception after in vitro fertilisation 17.1–34.4%
History of sexually transmitted disease 12.5–25.0%