Table 1 Demographic and clinical characteristics between two groups in patients with COVID-19 Variables Early-stage group (n = 34) Progressive-stage group (n = 28) p value Demographic   Age, (years) 44.32 ± 13.53 50.82 ± 13.23 0.062   Male 18 (52.9%) 16 (57.1%) 0.741 (χ) Exposure history 0.494 (χ)   Positive 27 (79.4%) 24 (85.7%)   Negative 4 (11.8%) 1 (3.6%)   Unknown 3 (8.8%) 3 (10.7%) Symptoms   Fever (°C) 37.70 ± 0.73 37.66 ± 0.94 0.854   < 37.4 °C 8 (23.5%) 11 (39.3%) 0.064 (χ)   37.4–38 °C 20 (58.8%) 9 (32.1%)   38.1–39 °C 4 (11.8%) 6 (21.4%)   39.1–41 °C 2 (5.9%) 2 (7.1%) Laboratory tests   CRP (mg/L) 15.98 (1.78–55.98) 35.62 (5.63–63.04) 0.329   White blood cell count (× 109/L) 5.78 ± 1.93 6.24 ± 3.55 0.518   Neutrophil count (× 109/L) 0.71 ± 0.13 0.74 ± 0.11 0.343   Lymphocyte count (× 109/L) 1.04 ± 0.49 0.97 ± 0.46 0.541   Platelet count (× 109/L) 180.79 ± 66.83 190.18 ± 73.91 0.602   Hemoglobin (g/dL) 13.72 ± 1.79 13.69 ± 1.80 0.956   Procalcitonin (ng/mL) 0.05 (0.04–0.07) 0.07 (0.04–0.11) 0.234 COVID-19, coronavirus disease 2019; CRP, C-reactive protein