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p=0.993. PCR: polymerase chain reaction.
| Rh blood subgroup | PCR and lung involvement status | Total | ||
| PCR (-) | PCR+CT finding (-) | PCR+CT finding (+) | ||
| Negative | 9 (13.4%) | 6 (12.8%) | 13 (13.4%) | 28 (13.3%) |
| Positive | 58 (86.6%) | 41 (87.2%) | 84 (86.6%) | 183 (86.7%) |
| Total | 67 (100%) | 47 (100%) | 97 (100%) | 211 (100%) |
