Table 3.

Association of vitamin and supplement (VS) use with demographic characteristics among unaffected brothers of men with prostate cancer (n=542). Models are adjusted for age at time of survey.^*

	Currently Using Any VS OR (95% CI)	Currently Using only Vitamins OR(95% CI)	Currently Using VS (excluding MV) OR (95% CI)	Currently Using Prostate- Related VS OR (95% CI)
Age at time of survey (yr)	1.03 (1.01–1.05)	1.03 (1.01–1.05)	1.04 (1.02–1.06)	1.04 (1.02–1.07)
Younger age at survey compared to brother’s age at diagnosis*	1.03 (0.69–1.53)	0.90 (0.60–1.33)	1.33 (0.88–2.00)	1.22 (0.80–1.86)
Birth Order*
Younger	1.30 (0.89–1.91)	1.20 (0.83–1.74)	1.61 (1.09–2.39)	1.51 (1.01–2.25)
Older	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Marital status*
Married	1.04 (0.65–1.68)	0.97 (0.60–1.55)	1.22 (0.73–2.03)	1.30 (0.77–2.22)
Not married	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Education *
≥ 16 years	1.25 (0.89–1.77)	1.23 (0.88–1.74)	1.27 (0.89–1.81)	1.20 (0.83–1.73)
< 16 years	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Income*
≥$75,000	1.33 (0.94–1.90)	1.28 (0.90–1.81)	1.10 (0.77–1.59)	1.03 (0.71–1.49)
<$75,000	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Number of first degree affecteds*
≥ 2	1.24 (0.87–1.75)	1.25 (0.89–1.77)	1.27 (0.89–1.83)	1.24 (0.85–1.79)
1	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Number of first degree affecteds*(continuous)	1.11 (0.90–1.37)	1.13 (0.92–1.39)	1.11 (0.91–1.37)	1.12 (0.91–1.39)
Smoking status*
Smoker	1.00 (0.71–1.42)	0.99 (0.70–1.39)	0.93 (0.65–1.33)	0.93 (0.64–1.34)
Non-Smoker	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)

^*Models are adjusted for age at time of survey.