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*P-value of <0.05 is statistically significant; #Chi-square test.
COVID-19: coronavirus disease 2019
| Severity | |||||
| Mild | Moderate | Severe | P-value | ||
| Blood group | A | 4 (8.7) | 17 (37.0) | 25 (54.3) | 0.004*# |
| B | 2 (4.5) | 25 (56.8) | 17 (38.6) | ||
| AB | 3 (27.3) | 7 (63.6) | 1 (9.1) | ||
| O | 5 (10.2) | 33 (67.3) | 11 (22.4) | ||
| Rh group | Rh+ | 14 (9.9) | 75 (53.2) | 52 (36.9) | 0.432# |
| Rh– | 0 (0.0) | 7 (8.5) | 2 (3.7) | ||
