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Severity of COVID-19 and blood groups using Chi-Squared test.
| Blood group (Mean ± SD∗) | ||||||
| Severity | Overall (n = 404) | O (n = 252) | A (n = 103) | B (n = 41) | AB (n = 8) | P |
| Non-severe | 378 (93.6%) | 235 (93.3%) | 99 (96.1%) | 36 (87.8%) | 8 (100%) | .34 |
| Severe | 26 (6.4%) | 17 (6.7%) | 4 (3.9%) | 5 (12.2%) | 0 | |
