Table 4. Odds ratio (95% confidence interval) of incident cognitive impairment according to baseline 25-hydroxyvitamin D concentrations modeled as race-specific tertiles and stratified by race.

	25(OH)D Tertile 1> 23 ng/ml for blacks> 32 ng/ml for whites	25(OH)D Tertile 215–23 ng/ml for blacks25-32 ng/ml for whites	25(OH)D Tertile 3< 15 ng/ml for blacks< 25 ng/ml for whites
Black participants
Events	31	69	53
Model 1	ref	2.79 (1.64,4.76)	2.19 (1.26,3.83)
Model 2	ref	2.74 (1.48,5.07)	1.93 (0.98,3.79)
Model 3	ref	2.96 (1.48,5.94)	2.40 (1.07, 5.40)
White participants
Events	105	97	119
Model 1	ref	0.94 (0.64,1.38)	1.35 (0.92,1.96)
Model 2	ref	1.01 (0.66,1.56)	1.23 (0.79,1.90)
Model 3	ref	1.12 (0.70,1.78)	1.22 (0.76, 1.96)

25(OH)D, 25-hydroxyvitamin D; Model 1 is unadjusted; Model 2 is adjusted for geographic region of residence, season of blood draw, annual income, diabetes status, history of coronary heart disease, current smoking and depressive symptoms; Model 3 is adjusted for variables in model 2 plus estimated glomerular filtration rate, log-transformed albumin to creatinine ratio, phosphorus, calcium, and parathyroid hormone