Fig. 3

Comparison of lymphocyte counts and percentages among the four subgroups. DM, diabetes mellitus; non-DM, without diabetes mellitus; COVID-19, coronavirus disease 2019. a Lymphocyte count. b lymphocyte 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 groups, *P < 0.05, ****P < 0.0001