Table 1.
Characteristics of breast cancer cases and matched controls, Nurses’ Health Study II
Case (n=794) | Control (n=794) | |
---|---|---|
Age at blood collection (yr) | 44.7(4.5) | 44.8(4.4) |
Age at menarche (yr) | 12.4(1.3) | 12.5(1.4) |
BMI at age 18 (kg/m2) | 20.8(2.8) | 21.1(3.0) |
BMI at blood collection (kg/m2) | 25.1(5.0) | 25.8(6.0) |
Weight change since age 18 (kg) | 11.7(11.9) | 12.8(13.4) |
Total physical activity (METs/week) | 17.9 (15.5) | 18.8 (16.4) |
Number of children | 2.2(0.9) | 2.3(1.0) |
Age at first birth (yr)a | 26.6(4.7) | 26.2(4.6) |
Parity, % | 78.6 | 81.9 |
Ever breast fedb, % | 79.5 | 79.4 |
Premenopausal, % | 77.6 | 76.8 |
History of biopsy-confirmed benign breast disease, % | 23.4 | 15.4 |
Family history of breast cancer, % | 17.3 | 9.9 |
NSAIDs current regular usec, % | 13.3 | 13.8 |
Total fat (grams/day) | 59.0(12.3) | 58.4(12.5) |
Total Saturated Fat (grams/day) | 20.4(5.4) | 20.2(5.5) |
Total Monounsaturated Fat (grams/day) | 23.0(5.4) | 22.7(5.2) |
Total Polyunsaturated Fat (grams/day) | 9.8(2.3) | 9.7(2.4) |
Alcohol consumption (grams/day) | 3.8(6.9) | 3.3(5.8) |
Values are means(SD) or percentages.
Age at first birth among women with children indicated on 1995 questionnaire
Percent of breastfeeding among women with children on 1995 questionnaire
Non-steroidal anti-inflammatory medication, regular use defined as ≥2 times/week