Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Kaplan-Meier curves for rates of all-cause dementia by 25(OH)D status. The cut-off points for 25(OH)D insufficiency and deficiency were 35.2 nmol/L and 17.8 nmol/L, respectively, for spring, 50.4 nmol/L and 28.0 nmol/L for summer, 46.2 nmol/L and 24.0 nmol/L for autumn, and 33.4 nmol/L and 16.9 nmol/L for winter. The cut-off points were estimated based on the knots generated in Fig. 2.
