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Table 1 EPIC cohort characteristics for all women and postmenopausal women at baseline recruitment, 2010.

From: Adiposity, hormone replacement therapy use and breast cancer risk by age and hormone receptor status: a large prospective cohort study

  All women Postmenopausal women BMI tertiles6
    1 2 3
  ( n = 314760) (n = 144223) ( n = 36792) ( n = 48846) ( n = 58585)
Person years 3399178 1542924 391812 525727 625386
Age at recruitment 1 50.9(19.9-98.5) 58.1(27.8-98.5) 56.8(32.4-98.5) 57.8(32.3-94.9) 59.1(27.8-88.6)
Age at exit 1 61.9(21.1-102.4) 68.9(40.4-102.4) 67.7(40.4-102.4) 68.7(40.8-101.3) 69.8(40.5-98.3)
Years of follow-up 2 11.4(0.01-16.8) 11.5(0.01-16.7) 11.6(0.01-16.7) 11.6(0.02-16.6) 11.5(0.01-16.6)
Years until diagnosis 3 6.1(0.01-15.6) 6.0(0.01-15.3) 5.8(0.01-14.4) 6.0(0.02-14.7) 6.0(0.01-15.3)
BMI (kg/m 2 ) 1 24.02(10.2-77.9) 24.8(12.9-77.9) 21.1(12.9-22.5) 24.1(22.6-25-8) 28.8(25.9-77.9)
Hip circumference (cm) 100.0(50.0-179.0) 81.0(51.0-179.0) 71.0(52.0-117.0) 78.0(51.0-171.0) 90.0(52.0-179.0)
Waist circumference (cm) 78.0(50.0-179.0) 101.0(53.0-171.0) 93.0(57.0-115.0) 99.0(55.0-158.0) 107.5(53.0-171.0)
Premenopausal 4 35.5%(111560) - - - -
Peri/or of unknown menopausal status 4 18.7%(58887) - - - -
Postmenopausal 4 45.8%(144223) - - - -
Never HRT user 5 38.4%(120992) 54.7%(78,919) 45.0%(16569) 51.4%(25108) 63.6%(37242)
Past HRT user 5 7.0%(21980) 12.7%(18,278) 12.6%(4640) 13.1%(6401) 12.4%(7237)
Current HRT user 5 16.5%(51975) 29.6%(42,719) 39.8%(1462) 32.4%(15826) 20.9%(12266)
Missing HRT use 5 38.0%(119723) 3%(4,307) 2.6%(956) 3.1%(1511) 3.1%(1840)
  1. 1Median (range); 2reverse Kaplan Meier median (range); 3in primary incident cases only; 4percentage (number); 5excluding premenopausal women at baseline recruitment; 6in postmenopausal women at baseline recruitment only. BMI, body mass index; HRT, hormone replacement therapy.