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. Author manuscript; available in PMC: 2019 Mar 15.
Published in final edited form as: Int J Cancer. 2017 Nov 10;142(6):1116–1129. doi: 10.1002/ijc.31133

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.

a

Age at first birth among women with children indicated on 1995 questionnaire

b

Percent of breastfeeding among women with children on 1995 questionnaire

c

Non-steroidal anti-inflammatory medication, regular use defined as ≥2 times/week

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