Table 4

Dietary and supplemental intake of vitamin D and breast cancer risk among white women: NHANES I Epidemiologic Follow-up Study, 1971–1975 to 1992

Breast cancer casesAge-adjusted RR (95% CI)Multivariate-adjusted RR (95% CI)a
Dietary vitamin D
 <100 IU861.01.0
 100–199 IU511.03 (0.73–1.45)1.05 (0.74–1.49)
 ≥200 IU400.84 (0.58–1.23)0.85 (0.59–1.24)
P for trendP = 0.43P = 0.48
Supplement use (multivitamins or single vitamin D)
 Never1331.01.0
 Weekly130.94 (0.53–1.65)0.89 (0.50–1.58)
 Daily310.93 (0.63–1.38)0.89 (0.60–1.32)
P for trendP = 0.69P = 0.52
Vitamin D from food or supplements
 <100 IU without daily supplements731.01.0
 100–199 IU without daily supplements410.98 (0.67–1.44)1.01 (0.69–1.49)
 ≥200 IU or daily supplements630.87 (0.62–1.21)0.86 (0.61–1.20)
P for trendP = 0.40P = 0.37
  • a Adjusted for age, education, age at menarche, age at menopause, body mass index, frequency of alcohol consumption, physical activity, and calcium intake.