The aim of this study is to compare the rate of obstetric complications at first spontaneous pregnancy among women with endometriosis, with the rate of obstetric complications at first spontaneous pregnancy among women without endometriosis

All women followed up for a surgical or clinical/sonographic diagnosis of endometriosis in 11 italian referral Centres for the treatment of endometriosis, completed a questionnaire regarding their previous pregnancies. The same questionnaire was completed by women, attending a routine gynecologic visit, in whom surgery or clinical/sonographic evaluation excluded endometriosis.

Inclusion Criteria:

• 30 to 50 years old women with at least one previous spontaneous pregnancy > 12 weeks with surgical or clinical/sonographic diagnosis of endometriosis or in whom surgical or clinical/sonographic evaluation ruled out endometriosis

Exclusion Criteria:

• Pregnancy achieved by assisted reproductive techniques
• Pregnancy terminated before 12 gestational weeks
• Twin pregnancy
• Preexisting hypertension
• Lupus like anti-coagulant
• Non corrected uterine malformation
• Recurrent abortion

All continuous women attending endometriosis clinics or undergoing a routine gynecological examination matching the inclusion criteria