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p=0.3. PCR: polymerase chain reaction.
| ABO blood subgroup | PCR and lung involvement status | Total | ||
| PCR (-) | PCR+CT finding (-) | PCR+CT finding (+) | ||
| A | 32 (47.8%) | 17 (36.2%) | 52 (53.6%) | 101 (47.9%) |
| B | 12 (17.9%) | 10 (21.3%) | 10 (10.3%) | 32 (15.1%) |
| O | 19 (28.4%) | 19 (40.4%) | 31 (32%) | 69 (32.7%) |
| AB | 4 (5.9%) | 1 (2.1%) | 4 (4.1%) | 9 (4.3%%) |
| Total | 67 (100%) | 47 (100%) | 97 (100%) | 211 (100%) |
