Figure 3. Correlation of frequencies of CD14+HLA-DRlo/neg MDSCs and clinical and laboratory indexes in all COVID-19 patients. Frequencies of CD14+HLA-DRlo/neg MDSCs were positively correlated with neutrophil (A), D-dimer (D), C-reactive protein (E) and length of hospitalization (F), and was negatively associated with lymphocyte (B) and albumin (C). Abbreviations: MDSCs, myeloid-derived suppressor cells.