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This study aims to evaluate the prevalence of vitamin D deficiency and the correlation between serum 25-hydroxyvitamin D (25(OH)D) and mortality.  Materials and methods  A prospective observational study was conducted among 522 children admitted to the Pediatric Intensive Care Unit in the Pediatrics Department of the Jawaharlal Institute of Postgraduate Medical Education and Research, Pondicherry, India. After measuring vitamin D levels, children were assigned into three groups based on their serum 25(OH)D levels: a sufficient group (25(OH)D level ≥ 30 ng/mL), an insufficient group (25(OH)D level = 20-29.9 ng/mL), and a deficient group (25(OH)D level < 20 ng/mL). Each group was again divided into two sub-groups (survivors and non-survivors if death was the outcome), and then each sub-group was again divided into two groups (sepsis and all non-septic causes). Results were evaluated for an association with mortality.  Results  A majority (66.6%) of patients who died had low levels of 25(OH)D (deficient = 37.9%; insufficient = 28.7%). Mortality was higher in children with 25(OH)D deficiency (P = 0.03). In univariate analysis, 25(OH)D deficiency was strongly associated with sepsis in children according to our observation, with 51% from the deficient group, 38% from the insufficient group, and 27.5% from the sufficient group (P ≤ 0.01). Mortality is not associated with 25(OH)D deficiency or insufficiency in multilogistic regression analysis. A serum vitamin D level of 20 ng/mL can predict higher mortality, with a specificity of 62.1%.  Conclusions  Vitamin D supplementation may be recommended for PICU-admitted cases to decrease the risk of sepsis. This association can be explored more in the future among the community population for further recommendations.

Vitamin D Status at Admission and Its Association With Mortality in Children Admitted to the Pediatric Intensive Care Unit