Table 1.

Baseline characteristics by tertiles of energy-adjusted vitamin D, vitamin D supplement, and quartiles of UVR dose at place of residence (n = 67,721) E3N cohort 1993 to 2005

 Vitamin D dietary intakes, IU/d % or mean (SD)Mean daily UVR doses, kJ/m2/d % or mean (SD)
Baseline characteristics< 8080–113> 113Supplement< 2.42.4–2.52.5–2.7> 2.7
N21,36221,43121,3673,56117,18915,94617,92616,660
Age, y52.7 (6.8)52.4 (6.5)52.8 (6.5)54.3 (6.8)52.5 (6.7)52.4 (6.6)52.8 (6.7)53.3 (6.6)
Age at menarche, y12.9 (1.4)12.8 (1.4)12.7 (1.4)12.8 (1.4)12.8 (1.4)12.8 (1.4)12.7 (1.4)12.7 (1.4)
BMI
 <2018.515.412.013.314.415,016.416.5
 20–2565.164.663.165.263.064.864.465.0
 >2516.420.024.921.522.620.219.218.5
Number of full-term pregnancies2.0 (1.1)2.0 (1.1)2.0 (1.1)1.9 (1.2)2.0 (1.2)2.1 (1.1)2.0 (1.1)2.0 (1.1)
Postmenopausal%53.853.256.271.153.253.255.259.5
Age at menopause
 <4713.413.314.216.713.413.213.814.6
 47–5259.659.760.257.360.760.758.858.7
 >5227.027.025.626.025.926.127.426.7
University degree, %85.986.386.086.985.986.585.886.3
First degree relative with breast cancer, %11.911.511.511.811.412.111.112.0
History of benign breast disease, %26.226.725.827.026.425.926.126.4
Previous mammography, %32.633.435.733.634.235.034.835.2
Ever oral contraceptive use, %39.742.140.939.441.141.940.438.8
Use of postmenopausal MHT, %
 Never70.869.166.756.868.767.569.267.4
 Current18.320.321.825.720.721.519.620.1
 Past10.910.611.517.510.611.011.212.5
Dietary variables
Alcohol intake, g/d9.9 (1.3)11.3 (1.4)12.5 (1.5)10.0 (1.3)12.3 (1.5)12.2 (1.4)10.2 (1.3)10.9 (1.5)
Mean dietary calcium intake, mg/d1,006.1 (315.1)1,015.3 (298.4)1,038.2 (302.7)1,050.5 (330.8)1,012.5 (313.2)1,009.5 (297.4)1,020.2 (301.5)1,043.7 (315.1)
Mean dietary vitamin D intake, IU/d60 (16)96 (8)156 (44)104 (48)108 (48)108 (48)104 (47)100 (48)
Total energy intake without alcohol, kcal/d2,139.6 (557.8)2,025.9 (543.9)2,110.2 (569.7)2,067.9 (552.9)2,098.0 (563.9)2,103.1 (558.7)2,097.8 (553.8)2,063.9 (558.9)
Calcium supplement use, %a17.016.216.378.318.618.419.822.2
Sun-related variables
UVR dose exposure (kJ/m2/day)2.6 (0.3)2.6 (0.3)2.5 (0.3)2.6 (0.3)2.3 (0.1)2.4 (0.04)2.6 (0.07)2.9 (0.1)
Latitude for region of residence46.8 (2.2)47.0 (2.2)47.1 (2.2)46.8 (2.2)49.3 (0.7)48.4 (0.4)46.1 (1.1)44.0 (0.8)
Sunburn resistance
 Low28.228.127.827.129.229.427.126.4
 Medium50.449.649.050.750.550.149.848.4
 High21.422.323.222.220.320.523.125.2
Skin complexion
 Fair1.01.11.20.81.31.21.00.9
 Medium58.858.457.959.261.460.856.754.8
 Dark38.739.239.338.436.136.740.742.3
 Very dark1.51.31.61.61.21.31.61.9
Recreational physical activity, METs-h/wk
  <3423.324.225.321.026.125.524.120.6
  34–4624.325.024.523.725.924.823.823.7
  46–6226.826.425.826.125.826.326.426.8
  >6225.624.424.429.222.223.425.728.9