title: Epidemiology of endometriosis in infertile women.
abstract: OBJECTIVE
  To assess the epidemiological factors linked to endometriosis in infertile women.
  
  
  METHODS
  Academic tertiary hospital.
  
  
  METHODS
  Case-control study.
  
  
  METHODS
  One hundred seventy-four infertile women with endometriosis and 174 infertile women without endometriosis, all of them studied by laparoscopy.
  
  
  RESULTS
  Women with endometriosis and infertility had a higher frequency of cycles < or = 27 days (26.4% versus 16.7%). A trend to a protective effect of smoking was detected. Social class, reproductive history, infertility history, previous abortions, age, family history, age at menarche, and duration of menstrual flow were similar in both groups.
  
  
  CONCLUSIONS
  Cycles < or = 27 days was the only risk factor that seemed to be associated to endometriosis in infertile patients. However, predictive values were low. A trend to a protective effect of smoking was detected.
authors: Hospital of Cruces, Baracaldo, País Vasco University, Bilbao, Spain.
authors: R
authors: R
authors: Matorras
authors: F
authors: F
authors: Rodíquez
authors: J I
authors: JI
authors: Pijoan
authors: O
authors: O
authors: Ramón
authors: G
authors: G
authors: Gutierrez de Terán
authors: F
authors: F
authors: Rodríguez-Escudero
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D004715:Endometriosis / Q000150:complications* / Q000453:epidemiology* / Q000473:pathology; D005260:Female; D006801:Humans; D007247:Infertility, Female / Q000150:complications*; D010535:Laparoscopy; D008597:Menstrual Cycle; D011247:Pregnancy; D012907:Smoking; D013997:Time Factors