Epidemiological factors have been extrapolated primarily from cohorts of women with pelvic pain and infertility, which complicate the assessment of prevalence. Low-end estimates of prevalence are 1% to 7% for women undergoing gynaecological surgery, including tubal sterilisation.[2] These estimates may be misleading since this analysis was conducted in parous women, who are less likely to be diagnosed with endometriosis. It is generally accepted that up to 10% of reproductive-aged women are affected by endometriosis, and that the average age of diagnosis is 28 years old. Furthermore, it is well documented that women with a first-degree relative with endometriosis have a 7- to 10-fold increased risk of having it themselves.[3][4]

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