Table 1.

Baseline characteristics of the 967 study participants with complete data on serum 25(OH)D and complete cognitive data at baseline and 2-year follow-up.

	Baseline Serum Vitamin D Quintile
	Q1	Q2	Q3	Q4	Q5	p-trend
	n = 150	n = 213	n = 219	n = 179	n = 206
Serum 25(OH)D (range)	21.2	31.5	41.5	51.1	68.4
nmol/L	(10–25)	(27–35)	(38–45)	(48–55)	(58–120)
Age (mean), yearsa	55.6	56.0	56.4	56.8	57.1	0.03
BMI (mean), kg/m2	32.6	32.2	31.8	31.4	31.0	0.63
MMSE score (mean)	24.1	24.0	23.9	23.8	23.7	0.21
Women %b	74.7	74.0	73.3	72.5	71.8	0.53
Past smoker %	29.4	30.2	30.9	31.8	32.6	0.51
Current smoker %	27.4	24.8	22.3	20.0	17.9	0.03
Physical activity score (mean)	31.4	31.6	31.8	32.0	32.2	0.02
Less then high school education %	41.7	41.0	40.3	39.5	38.8	0.37
Current alcohol use %	44.1	43.9	43.7	43.6	43.4	0.96
Past alcohol use %	28.9	28.5	28.2	27.8	27.4	0.63
Diabetes %	36.9	36.1	35.4	34.7	33.9	0.39
High CRP (≥3 mg/dL) %	61.5	59.3	57.0	54.7	52.4	0.07
Hypertension %	71.7	70.3	68.9	67.5	66.1	0.72

All values adjusted for age and sex.

^aadjusted for sex

^badjusted for age