title: Do reproductive and hormonal risk factors for breast cancer associate with attendance at mammography screening?
abstract: OBJECTIVE
  To determine whether reproductive and hormonal risk factors for breast cancer associate with mammography attendance.
  
  
  METHODS
  We linked data from the Malmö Diet and Cancer Study to the Malmö mammography register (Sweden, 1992-2009). We analyzed 11,409 women (age 44-72) who were free of breast cancer at study entry and a total of 69,746 screening invitations. Generalized Estimating Equations were used to account for repeated measures within subjects. Models were adjusted for age and other sociodemographic factors.
  
  
  RESULTS
  In this study cohort, mammography screening attendance ranged from 87.6 to 94.5% between calendar years, with an average attendance of 92%. Higher attendance was found among women who had given birth to fewer than three children (ORs ranging between 1.15 and 1.37) and had used oral contraceptives (OC) within the last decade (OR = 1.22, 95% CI 1.07-1.38) and for a longer period (OR = 1.13, 95% CI 1.01-1.27). A lower odds of attendance was found among post-menopausal women (OR = 0.86, 95% CI 0.77-0.96). Age < 13 at menarche, age ≥ 30 at first childbirth, age ≥ 55 at menopause, age < 20 at first OC use, nulliparity, breastfeeding, and hormone replacement therapy were not associated with mammography attendance.
  
  
  CONCLUSIONS
  Reproductive and hormonal risk factors for breast cancer have little effect on mammography screening attendance. This may indicate a potential for under-screening of some women at higher risk.
authors.affiliation: Department of Clinical Sciences in Malmö, Diagnostic Radiology, Lund University, Skåne University Hospital Malmö, Inga Marie Nilssons gata 49, 205 02, Malmö, Sweden, mlagerlu@gmail.com.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Lagerlund
authors.forename: Jessica M
authors.initials: JM
authors.lastname: Sontrop
authors.forename: Sophia
authors.initials: S
authors.lastname: Zackrisson
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000000981:diagnostic imaging / Q000453:epidemiology* / Q000517:prevention & control; D015331:Cohort Studies; D003276:Contraceptives, Oral / Q000008:administration & dosage; D055088:Early Detection of Cancer / Q000379:methods / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D008327:Mammography / Q000379:methods / Q000706:statistics & numerical data*; D008572:Menarche; D008875:Middle Aged; D017584:Reproductive History; D012307:Risk Factors; D011795:Surveys and Questionnaires; D013548:Sweden / Q000453:epidemiology; D016896:Treatment Outcome
chemical_list: D003276:Contraceptives, Oral