Alpcan, AysegulTursun, SerkanKandur, Yasar2025-01-212025-01-2120210950-26881469-4409https://doi.org/10.1017/S0950268821001825https://hdl.handle.net/20.500.12587/25866Several studies have demonstrated that higher levels of vitamin D are associated with better prognosis and outcomes in infectious diseases. We aimed to compare the vitamin D levels of paediatric patients with mild/moderate coronavirus disease 2019 (COVID-19) disease and a healthy control group. We retrospectively reviewed the medical records of patients who were hospitalised at our university hospital with the diagnosis of COVID-19 during the period between 25 May 2020 and 24 December 2020. The mean age of the COVID-19 patients was 10.7 +/- 5.5 years (range 1-18 years); 43 (57.3%) COVID-19 patients were male. The mean serum vitamin D level was significantly lower in the COVID-19 group than the control group (21.5 +/- 10.0 vs. 28.0 +/- 11.0 IU, P < 0.001). The proportion of patients with vitamin D deficiency was significantly higher in the COVID-19 group than the control group (44% vs. 17.5%, P < 0.001). Patients with low vitamin D levels were older than the patients with normal vitamin D levels (11.6 +/- 4.9 vs. 6.2 +/- 1.8 years, P = 0.016). There was a significant male preponderance in the normal vitamin D group compared with the low vitamin D group (91.7% vs. 50.8%, P = 0.03). C-reactive protein level was higher in the low vitamin D group, although the difference did not reach statistical significance (9.6 +/- 2.2 vs. 4.5 +/- 1.6 mg/l, P = 0.074). Our study provides an insight into the relationship between vitamin D deficiency and COVID-19 for future studies. Empiric intervention with vitamin D can be justified by low serum vitamin D levels.eninfo:eu-repo/semantics/openAccessChildren; COVID-19; vitamin DArticle14910.1017/S09502688210018252-s2.0-8511383525434375576Q2WOS:000683532200001Q2