Prevalence of endometriosis in the general population is unknown since diagnosis requires laparoscopic conformation. The estimated prevalence of the disease is thought to be between 1.5% to 6.2% (1).
Ectopic endometrial tissue is found in 10-15% of all women in the reproductive years (1).
However as the use of laparoscopy has become more widespread, these associations are seen to be less certain.
Endometriosis tends to regress during pregnancy, due to the predominance of progesterone, and after the menopause in women not on oestrogen replacement therapy. Combined oral contraceptive pill users have a lower incidence of endometriosis.
Heritability studies have shown that the risk of endometriosis is higher in women with affected first degree relatives (4).
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