Fig. 6

Comparison of NK lymphocyte count and percentage among the four subgroups. DM, diabetes mellitus; non-DM, without diabetes mellitus; COVID-19, coronavirus disease 2019. a NK lymphocyte count. b NK lymphocytes percentage. Unpaired one-way ANOVA was used for intergroup comparisons (a, b P all < 0.0001). Unpaired t-tests was used for comparisons with the control group or between two subgroups, *P < 0.05, **P < 0.01, ****P < 0.0001