title: Oral contraceptive use and risk of fractures.
abstract: BACKGROUND
  Prior studies have suggested that oral contraceptives (OCs) may be associated with an increased fracture risk. However, the previous studies have only performed a limited adjustment for other potential risk factors.
  
  
  METHODS
  All women with a fracture (n=64,548) in the year 2000 in Denmark served as cases. For each case, three age-matched controls were randomly drawn from the general population (n=193,641). Exposure was use of OCs between January 1, 1996, and December 31, 2000. Adjustments were made for use of other drugs, pregnancy, prior fracture, other diseases and social variables.
  
  
  RESULTS
  In the unadjusted analysis, use of OCs in low dose was associated with a small increase in overall fracture risk. However, upon adjustment, no increase in fracture risk could be demonstrated in any age or dose group.
  
  
  CONCLUSIONS
  Oral contraceptives are not associated with an increase or a decrease in fracture risk. Any change in fracture risk may be due to confounders.
authors.affiliation: Department of Endocrinology and Metabolism C, Aarhus University Hospital, Aarhus Amtssygehus, DK-8000 Aarhus, Denmark. p-vest@post4.tele.dk
authors.forename: Peter
authors.initials: P
authors.lastname: Vestergaard
authors.forename: Lars
authors.initials: L
authors.lastname: Rejnmark
authors.forename: Leif
authors.initials: L
authors.lastname: Mosekilde
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D015986:Confounding Factors, Epidemiologic; D003276:Contraceptives, Oral / Q000009:adverse effects*; D003718:Denmark / Q000453:epidemiology; D005260:Female; D050723:Fractures, Bone / Q000139:chemically induced* / Q000453:epidemiology; D006801:Humans; D008875:Middle Aged; D012042:Registries; D012307:Risk Factors
chemical_list: D003276:Contraceptives, Oral