Figure 2.

Change in cognitive function by category of serum 25(OH)D concentration. Results are based on a random-effects model with multivariate adjustment for clinic site, season of blood collection, age at baseline, years of education, self-reported health status, instrumental activity of daily living impairments, smoking status at baseline, body mass index, history of hypertension, history of diabetes, depression, and baseline cognitive score. P values for comparison with >30ng/mL (reference): 20–29 ng/mL p = .1630; 10–19 ng/mL p = .7969; <10 ng/mL p = .0385.