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Comparison of mortality, ventilation time and ICU stay time in two groups (mean ± SD)
| Variable | HB group | NHB group | P value |
| Mortality | 4.10% | 0.3%b | P < 0.01 |
| Ventilation time (h) | 25.5 ± 13.3 | 16.5 ± 9.2a | P < 0.05 |
| ICU stay time (d) | 11.5 ± 6.5 | 4.1 ± 3.9a | P < 0.05 |
P < 0.01 vs HB group;
P < 0.05 vs HB group.
