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. Author manuscript; available in PMC: 2022 Feb 1.
Published in final edited form as: J Am Geriatr Soc. 2020 Oct 5;69(2):365–372. doi: 10.1111/jgs.16853

Figure 1: Serum vitamin D and rates of incident delirium diagnosis.

Figure 1:

A) Analysis of serum vitamin D (nmol/L) at baseline and rates of incident delirium diagnosis using Cox’s proportional hazards regression models adjusted for age, sex, assessment center, assessment month, and self-reported ethnicity. A smoothing spline function was applied to determine the non-linear effect of vitamin D on risk of incident delirium. The x-axis is limited to 100 nmol/L for clarity, see Supplementary Figure S3 for the unrestricted plot. B) Unadjusted cumulative event plot showing the proportion of the participants with a diagnosis of delirium in the hospital in three groups, based on baseline vitamin D sufficiency. R package `survminer` (v0.4.8) used for plot B).