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 cases	Age-adjusted RR (95% CI)	Multivariate-adjusted RR (95% CI)^a
Dietary vitamin D
<100 IU	86	1.0	1.0
100–199 IU	51	1.03 (0.73–1.45)	1.05 (0.74–1.49)
≥200 IU	40	0.84 (0.58–1.23)	0.85 (0.59–1.24)
P for trend		P = 0.43	P = 0.48
Supplement use (multivitamins or single vitamin D)
Never	133	1.0	1.0
Weekly	13	0.94 (0.53–1.65)	0.89 (0.50–1.58)
Daily	31	0.93 (0.63–1.38)	0.89 (0.60–1.32)
P for trend		P = 0.69	P = 0.52
Vitamin D from food or supplements
<100 IU without daily supplements	73	1.0	1.0
100–199 IU without daily supplements	41	0.98 (0.67–1.44)	1.01 (0.69–1.49)
≥200 IU or daily supplements	63	0.87 (0.62–1.21)	0.86 (0.61–1.20)
P for trend		P = 0.40	P = 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.