Table 1.

Baseline characteristics of case and control subjects, all centers combined, the EPIC cohort, 2007

CovariateCasesControlsPdiffa
Numbers of subjects554821
ER-positive382602
ER-negative172219
PR-positive211345
PR-negative197285
ER+PR+200328
ER+PR-80133
ER-PR-117152
Age at blood donation59.860.1
Years since menopause (blood donation)10.711.1
Years since menopause (diagnosis)–study phase 114.4
Years since menopause (diagnosis)–study phase 215.9
Years between blood donation and diagnosis4.3
Age at menarche13.313.30.86
Age at menopause49.349.00.50
Body-mass index (kg/m2)26.4260.02
Waist circumference (cm)83.182.50.11
  • aP for difference from paired t test.