Fig. 2
From: Circulating Vitamin D levels status and clinical prognostic indices in COVID-19 patients
The histograms indicate that patients belonging to Group 1 had a statistically significant difference with Group2. The a indicate that patients in Group 1 with low Vit D levels had more elevated CD4/CD8 ratio (a), NLR (c) and dNLR (d). Contrarily, CD8 + cell count was lower in Group 1 than Group 2 (b). The comparison of quantitative variables between groups was performed using the Student's t test and by the Mann‐Whitney‐Wilcoxon text for independent samples