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| Group | 28-day fatality (%) | Actual fatality (%) | Fatality excluding cases with ≥2 major post-operative complications | Number of post-operative complications |
|---|---|---|---|---|
| NPPV | 6.25 (2/32) | 6.25 (2/32) | 3.2% (1/31) | 1.25±0.58 |
| IPPV | 21.9 (7/32) | 25 (8/32)* | 3.8% (1/26) | 2.13±0.81** |
*P<0.05, **P<0.01.
