Abstract
Background and objectives
25-hydroxyvitamin D [25(OH)D] deficiency is prevalent in patients with chronic kidney disease (CKD), the associations between serum 25(OH)D levels and mortality in patients with CKD remain unclear, and this study aimed to explore these associations further.
Methods
4989 participants with CKD were enrolled in the study, and the Cox regression model was used to assess the effects of serum 25(OH)D concentrations on mortality risk. A restricted cubic spline model was used to explore the dose–response relationships, and threshold effect analysis was performed based on inflection points identified by a two-piecewise linear regression model. In addition, subgroup and sensitivity analyses were employed.
Results
1255 participants died during a mean follow-up period of 70 months. Compared with the 25(OH)D-deficient group, the fully adjusted hazard ratios and 95% confidence intervals for the 25(OH)D-adequate group were 0.631 (0.545, 0.730) for all-cause mortality, 0.569 (0.435, 0.743) for cardiovascular mortality, 0.637 (0.461, 0.878) for hypertension mortality, and cancer mortality was 0.596 (0.426, 0.834). The inflection points of serum 25(OH)D concentration affecting all-cause and cardiovascular mortality were 89 nmol/L, and 107 nmol/L, respectively. Subgroup analyses and interaction tests suggested that the effects varied across populations. The results of sensitivity analyses indicated a reliable correlation.
Conclusion
We found an association between serum 25(OH)D concentrations and the prognosis of patients with CKD as a reliable predictor of early intervention and intensive care.
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Availability of data and materials
The original data used in this study are nationally representative and publicly available and can be directly obtained through application to NHANES, which is an ongoing periodic survey of a nationally representative sample of the U.S. noninstitutionalized civilian population using a complex multistage whole-population probability sampling strategy. More details about the survey can be found on the publicly available NHANES website. Data used in this study can be made available upon reasonable request.
Code availability
The code can be consulted with the corresponding author upon reasonable request.
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All authors contributed to the study’s conception and design. Material preparation was performed by Yaqing Wen, Yuying Wang, and Zhirui Wang. Formal analyses were performed by Yanpei Mai and Yushan Yi. The first draft of the manuscript was written by Yanpei Mai, and Yushan Yi, and Peixian Huang. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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The survey protocol for the NHANES was approved by the CDC’s National Center for Health Statistics Institutional Research Ethics Review Board (https://www.cdc.gov/nchs/nhanes/irba98.htm). The NCHS IRB/ERB Protocol number is Continuation of Protocol #2011–17.
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Mai, Y., Yi, Y., Wen, Y. et al. Associations between serum 25-hydroxyvitamin D and prognosis of chronic kidney disease: a prospective cohort study. Int Urol Nephrol (2024). https://doi.org/10.1007/s11255-024-04083-9
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DOI: https://doi.org/10.1007/s11255-024-04083-9