Table 1.

Baseline characteristics of the study population across tertiles of dietary vitamin E, vitamin C, beta carotene, and flavonoids (n=5,395)

	Vitamin E			Vitamin C			Beta carotene			Flavonoids
	T1	T2	T3	T1	T2	T3	T1	T2	T3	T1	T2	T3
Age, in years a	68.1	67.6	67.5	67.7	68.1	67.4	67.9	67.8	67.4	66.9	67.8	68.4
Education, %
Low	36	34	34	36	34	34	38	33	34	38	34	33
Intermediate	28	28	29	29	28	29	28	30	27	27	29	29
High	36	38	37	35	38	37	34	37	39	35	37	38
Alcohol, %
None	20	20	22	22	19	21	22	19	21	21	20	21
<1 drink/week	20	21	23	22	22	21	20	23	21	22	21	22
≥1 drink/week –	27	27	30	24	29	31	27	28	30	24	29	31
<1 drink/day
1–3 drinks/day	28	29	23	28	27	25	27	27	26	28	27	25
≥4 drinks/day	5	3	2	4	3	2	4	3	2	5	3	1
Smoking, %
Never	32	35	35	32	34	36	32	35	35	29	36	37
Former	41	42	45	39	44	45	41	41	46	38	42	48
Current	27	23	20	29	22	19	27	24	19	33	22	15
BMI, kg/m2 a	26.5	26.3	26.2	26.2	26.3	26.5	26.2	26.3	26.6	26.3	26.3	26.4
Total energy intake, kJ/day a	8350	8451	8295	8376	8413	8308	8357	8500	8239	8348	8484	8264
APOE ε4 carriers, %	28	27	28	29	27	28	28	27	28	28	29	26
Supplement use, % b	11	12	13	12	12	11	12	11	13	12	12	12

^aIndicates mean values.

^bSupplement use includes antioxidant supplements (multivitamins or single supplements for vitamins E or C, beta carotene, or flavonoids) and omega-3 supplements. Since only 19 people indicated use of omega-3 supplements at baseline, percentages for supplement use essentially reflect antioxidant supplement use.