Evaluation of risk factors associated with endometriosis.

Objective: To investigate the association between several factors such as demographics, personal habits, reproductive factors, menstrual characteristics, contraception, and clinical profile and the probability of having endometriosis.

Setting: Ten clinical institutions in the Montreal area.

Patient(s): A total of 2777 subjects who underwent surgery for diagnostic laparoscopy, tubal ligation, or hysterectomy between January 1998 and July 2002.