The Relationship between Serum Vitamin D Levels,C-Reactive Protein, and Anxiety Symptoms

ABSTRACT

Objective@#The aim of study is to investigate the relationship between serum vitamin D, c-reactive protein (CRP) levels, and anxietysymptoms. @*Methods@#Serum vitamin D and CRP levels of 51,003 Korean adult participants were collected retrospectively. Anxiety symptoms wereassessed using the Korean version of Beck Anxiety Inventory. Logistic regression was used to estimate the odds ratio (ORs) of anxietysymptoms by serum vitamin D and CRP levels. The regression was adjusted for covariates, and each model was adjusted mutually for vitaminD and CRP levels. @*Results@#Compared with sufficient vitamin D levels (≥20 ng/mL), insufficient (10–19.99 ng/mL) and deficient (<10 ng/mL) vitamin Dlevels were significantly associated with risk of anxiety symptoms. Also, continuous vitamin D levels were negatively associated with therisk of anxiety symptoms. CRP levels did not affect the relationship between vitamin D levels and risk of anxiety symptoms. @*Conclusion@#Insufficient (10–19.99 ng/mL) and deficient (<10 ng/mL) vitamin D levels were significantly associated with risk of anxietysymptoms. After adjusting for CRP levels, the results were not changed, and no evidence of interaction between vitamin D and CRP levelswas found. CRP levels did not account for the association between vitamin D levels and risk of anxiety symptoms.Psychiatry Investig 2020;17(4)312-319