Table 1 Main characteristics of the 5,262 FEDRA study women
From: Lifetime changes in body fatness and breast density in postmenopausal women: the FEDRA study
Characteristics | N (a) | Mean (SD) / % |
|---|---|---|
Age at EPIC enrollment (years) | 5262 | 49.03 (7.02) |
Age at follow-up (years) | 5262 | 58.93 (6.82) |
Age at first digital mammographic examination (years) | 5262 | 64.29 (6.41) |
Volumetric percent density at first digital mammographic examination (%) | 5262 | 7.84 (5.10) |
Dense volume at first digital mammographic examination (cm3) | 5262 | 47.71 (25.36) |
Non-dense volume at first digital mammographic examination (cm3) | 5262 | 701.05 (384.82) |
Available digital mammographic examinations per woman (n) | 5262 | 3.28 (1.63) |
Women with four digital mammographic examination (n) | 2316 | 44.0% |
Age at menarche (years) | 5249 | 12.38 (1.40) |
Age at first birth (years) | 4457 | 26.61 (4.34) |
Parity (n) | ||
 Nulliparous | 224 | 4.8% |
 One | 1614 | 34.5% |
 Two | 2277 | 48.6% |
 Three or more | 566 | 12.1% |
Breastfeeding (n) (among 4457 women with children) | 3917 | 87.9% |
Oral contraceptive (ever use) (n) | 2791 | 53.2% |
Postmenopause at EPIC enrollment (n) | 2395 | 45.6% |
Family history of breast cancer (n) | 370 | 7.0% |
Educational level at EPIC enrollment (n) | ||
 None/elementary school | 1192 | 22.8% |
 Secondary/ professional school | 1690 | 32.3% |
 High school | 1389 | 26.5% |
 Degree | 965 | 18.4% |
Body height at EPIC enrollment (cm) | 5203 | 160.3 (6.2) |
Body weight (kg) | ||
 At age 20 years | 4379 | 54.3 (7.3) |
 At age 40 years | 4492 | 59.7 (8.6) |
 At EPIC enrollment | 5202 | 64.0 (10.6) |
 At follow-up | 5252 | 65.9 (11.4) |
Body mass index (kg/m2) | ||
 At age 20 years | 4336 | 21.1 (2.5) |
 At age 40 years | 4443 | 23.2 (3.1) |
 At EPIC enrollment | 5201 | 24.9 (4.0) |
 At follow-up | 5193 | 25.7 (4.3) |
Annual weight change (kg/years) | ||
 From age 20 to 40 | 4036 | 0.3 (0.3) |
 From age 40 to EPIC enrollmentb | 3707 | 0.5 (1.3) |
 From EPIC enrollment to follow-upc | 5192 | 0.2 (0.6) |
Weight change categories from age 20 to 40 (n) | ||
 Weight gain > 10 kg | 653 | 16.2% |
 Weight gain > 5—≤ 10 kg | 1054 | 26.1% |
 Weight gain > 2—≤ 5 kg | 1184 | 29.3% |
 Stable weight (± 2 kg) | 885 | 22.0% |
 Weight loss > 2 kg | 260 | 6.4% |
Weight change categories from age 40 to EPIC enrollment (n) | ||
 Weight gain > 10 kg | 549 | 14.8% |
 Weight gain > 5—≤ 10 kg | 900 | 24.3% |
 Weight gain > 2—≤ 5 kg | 956 | 25.8% |
 Stable weight (± 2 kg) | 1055 | 28.4% |
 Weight loss > 2 kg | 247 | 6.7% |
Weight change categories from EPIC enrollment to follow-up (n) | ||
 Weight gain > 10 kg | 296 | 5.7% |
 Weight gain > 5—≤ 10 kg | 844 | 16.3% |
 Weight gain > 2—≤ 5 kg | 1181 | 22.8% |
 Stable weight (± 2 kg) | 1931 | 37.1% |
 Weight loss > 2 kg | 940 | 18.1% |