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The association between endometriosis and infertility is controversial, as endometriosis can be present in both fertile and infertile women. A review of the published studies showed that the prevalence of endometriosis was 4% in women with proven fertility undergoing laparoscopic sterilisation, whilst this figure was 13.5% in infertile population. Furthermore, this review demonstrated that endometriosis tends to be more advanced in infertile women, compared to women with proven fertility. A recent epidemiological study showed that endometriosis was associated with an age-adjusted two-fold increased risk of subsequent infertility, but only in women under the age of 35 years.