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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%