Figure 1.

Legend. Adjusted* restricted cubic spline model showing the hazard ratios (95% confidence intervals) for the association of 25(OH)D with incident dementia in whites and blacks. The solid line represents the hazard ratios and the dashed lines represents the 95% confidence intervals. Knots at 10^th, 50^th, and 90^th percentiles. Spline centered at the 75^th percentile. Histogram shows the distribution of concentrations of 25(OH)D. Restricted cubic spline truncated at 1^st and 99^th percentile of 25(OH)D.

*Model is adjusted for demographics variables (age, sex) and behavioral/socioeconomic variables (education, income, physical activity, smoking, alcohol use, body mass index, waist circumference, and vitamin D supplementation).