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. 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.
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