Table 1.

Clinical characteristics, sociodemographics, and postdiagnosis lifestyle factors by vitamin use at the 6-month interview after breast cancer diagnosis, SBCSS (N = 4,877)

PrevalenceVitamin usea after breast cancer diagnosis
Yes (n = 1,776)No (n = 3,101)Pb
n%n%n%
Age at diagnosis0.49
 <402364.8854.81514.9
 40–491,94039.869239.01,24840.3
 50–591,44529.651929.292629.9
 ≥601,25625.848027.077625.0
Education<0.001
 None1883.9392.21494.8
 Elementary3857.91176.62688.6
 Middle or high school3,53772.51,24169.92,29674.0
 College and above76715.737921.338812.5
Incomec<0.001
 <7001,37628.244625.193030.0
 700–9991,44129.648227.195930.9
 1,000–1,9991,48230.457632.490629.2
 ≥2,00057811.927215.33069.9
ER/PR status0.66
 Unknown911.9291.6622.0
 ER+/PR+2,43950.088850.01,55150.0
 ER+/PR63513.022012.441513.4
 ER/PR+3627.41327.42307.4
 ER/PR1,35027.750728.684327.2
TNM stage0.42
 Missing2234.6824.61414.6
 I1,68034.563035.51,05033.9
 IIA/IIB2,48250.989450.31,58851.2
 III–IV49210.11709.632210.4
Chemotherapy0.63
 No3807.81347.62467.9
 Yes4,49792.21,64292.52,85592.1
Radiotherapy0.11
 No3,28067.31,16965.82,11168.1
 Yes1,59732.860734.299031.9
Tamoxifen use0.06
 No2,35448.382546.51,52949.3
 Yes2,52351.795153.61,57250.7
BMI, kg/m20.05
 <253,15664.71,17666.21,98063.9
 25–291,44729.751829.292930.0
 ≥302745.6824.61926.2
Number of pregnancies0.14
 01974.0834.71143.7
 195919.735119.860819.6
 21,61433.155931.51,05534.0
 ≥32,10743.278344.11,32442.7
Regular smoker0.004
 No4,74997.41,74598.33,00496.9
 Yes1282.6311.8973.1
Regular alcohol drinker0.53
 No4,72796.91,72597.13,00296.8
 Yes1503.1512.9993.2
Regular tea drinker0.002
 No3,72076.31,31173.82,40977.7
 Yes1,15723.746526.269222.3
Regular exerciser<0.001
 No57632.457632.41,15537.3
 <5.1 MET-h/wk35620.135620.163120.4
 5.1 to 12.6 MET-h/wk40422.840422.864320.7
 ≥12.7 MET-h/wk44024.844024.867221.7
Family history of breast cancer0.58
 No4,60694.41,67394.22,93394.6
 Yes2715.61035.81685.4
Cruciferous vegetable intake, g/d0.003
 <39.961,22025.040823.081226.2
 39.96 to <63.721,21725.042123.779625.7
 63.72 to <96.701,22225.146025.976224.6
 ≥96.701,21825.048727.473123.6
Meat intake, g/d0.11
 <136.41,22025.041323.380726.0
 136.4 to <200.01,18224.243324.474924.2
 200.0 to <278.701,25525.745925.879625.7
 ≥278.701,22025.047126.574924.2
Soy protein intake, g/d<0.001
 <5.311,21825.038321.683526.9
 5.31 to <9.491,22125.043824.778325.3
 9.49 to <15.331,21725.044925.376824.8
 ≥15.331,22125.050628.571523.1
  • aVitamin use includes multivitamins; cod-liver oil; vitamins A, C, D, and E; B vitamins; and other unknown vitamin supplements.

  • bP value from chi-square test for general association of vitamin use with baseline participant characteristics.

  • cYuan reminibi per person per month. U.S. $1= 6.79 Chinese Yuan on August 17, 2010.