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
| Characteristic | Quintile | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Total niacin | Niacin from foods only | |||||||||
| 1 | 2 | 3 | 4 | 5 | 1 | 2 | 3 | 4 | 5 | |
| 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) | 7–15 | 16–18 | 18–22 | 22–36 | 36–171 | 7–14 | 14–16 | 16–18 | 18–20 | 20–48 |
| Age (median years) | 72.9 | 73.2 | 72.2 | 71.0 | 72.2 | 72.2 | 71.5 | 73.1 | 72.2 | 71.1 |
| Female (%) | 69.4 | 66.1 | 49.3 | 63.4 | 62.1 | 79.9 | 68.8 | 58.8 | 56.8 | 41.9 |
| Blacks (%) | 62.2 | 55.1 | 56.8 | 47.5 | 33.1 | 59.8 | 50.3 | 52.2 | 51.9 | 41.9 |
| Education (median years) | 11.4 | 12.2 | 12.6 | 12.7 | 13.0 | 11.9 | 12.6 | 12.5 | 12.8 | 13.3 |
| ApoE e4 (% with at least 1 allele) | 35.4 | 31.8 | 31.1 | 44.7 | 25.5 | 37.7 | 28.5 | 41.5 | 30.3 | 36.5 |
| Multivitamin Use (%) | 3.2 | 3.3 | 12.4 | 69.4 | 96.9 | 44.2 | 35.8 | 34.3 | 30.2 | 38.5 |
| Vitamin E in food (median IU/day) | 7.8 | 8.9 | 8.3 | 8.7 | 8.8 | 7.6 | 8.4 | 9.0 | 8.7 | 11.6 |
| Clinical stroke | 10.9 | 4.1 | 2.7 | 12.3 | 7.2 | 16.4 | 4.6 | 5.6 | 2.7 | 10.6 |
| Heart disease | 17.7 | 21.5 | 14.7 | 17.6 | 21.8 | 21.8 | 12.5 | 20.3 | 15.2 | 21.5 |
| Hypertension | 50.8 | 63.8 | 51.5 | 59.1 | 54.9 | 64.7 | 47.8 | 62.5 | 48.3 | 57.4 |
| Diabetes | 10.2 | 16.1 | 24.5 | 19.8 | 16.8 | 11.0 | 13.6 | 18.4 | 21.3 | 21.8 |