Table 4 Characteristics of the study population, N = 4926
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 |