Table 1

 Baseline characteristics by quintiles of total niacin intake including supplements, and niacin from food among 815 randomly selected participants of the Chicago Health and Aging Project

Total niacinNiacin from foods only
All percentages and medians are weighted for the stratified random sample design,
All variables (except age and niacin intake) are age standardised to the age distribution of the disease-free cohort at baseline.
Intake range (mg/day)7–1516–1818–2222–3636–1717–1414–1616–1818–2020–48
Age (median years)72.973.
Female (%)69.466.149.363.462.179.968.858.856.841.9
Blacks (%)
Education (median years)11.412.212.612.713.011.912.612.512.813.3
ApoE e4 (% with at least 1 allele)35.431.831.144.725.537.728.541.530.336.5
Multivitamin Use (%)3.23.312.469.496.944.235.834.330.238.5
Vitamin E in food (median IU/day)
Clinical stroke10.94.12.712.
Heart disease17.721.514.717.621.821.812.520.315.221.5