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Table 4 Characteristics of the study population, N = 4926

From: Factors associated with breast cancer recurrences or mortality and dynamic prediction of death using history of cancer recurrences: the French E3N cohort

  No. of women Percentage
Age at breast cancer diagnosis
  < 50 years 647 13.1
 [50–60) years 2145 43.5
 [60–70) years 1712 34.8
  ≥ 70 years 422 8.6
Menopausal status at breast cancer diagnosis
 postmenopausal woman - more than 5 years of cumulated MHT use 1144 23.2
 postmenopausal woman - less than 5 years of cumulated MHT use 1205 24.5
 postmenopausal woman - no use of MHT 1314 26.7
 premenopausal woman 923 18.7
 Missing 340 6.9
recent MHT use before diagnosis
 yes 1914 38.9
 no 2932 59.5
 missing 80 1.6
Smoking status before diagnosis
 never smoker 2624 53.3
 current smoker 562 11.4
 ex-smoker 1717 34.9
 missing 23 0.5
Smoking status at first follow-up after diagnosis
 never smoker 2624 53.3
 current smoker 314 6.4
 ex-smoker 1664 33.8
 missing 324 6,6
Family history of breast cancer before diagnosis
 0 3959 80.4
 1 804 16.3
 2–4 98 1.0
 missing 65 1.3
History of benign breast disease before diagnosis
 Yes 2575 52.3
 No 2351 47.7
History of diabetes before diagnosis
 Yes 258 5.2
 No 4668 94.8
Level of education before diagnosis
  < high school level 568 11.5
 high school level-second year university level 2351 47.7
  > second year university level 1803 36.6
 Missing 204 4.1
Alcohol consumption at diagnosis
 Yes 4105 83.3
 no 523 10.6
Missing 298 6.0
BMI at diagnosis
 underweight (< 18.5) 132 2.7
 normal (18.5- < 25) 3255 66.1
 overweight (25- < 30) 1073 21.8
 obese (≥ 30) 264 5.3
 Missing 202 4.1
  1. MHT menopausal hormonal treatment, BMI Body Mass Index