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Correlation analysis of PETCO2 and PaCO2 with different oxygenation indexes.
| Oxygenation indexes (mm Hg) | Cases | PETCO2 (mm Hg) | PaCO2 (mm Hg) | PaCO2- PETCO2 gap (mm Hg) | r | P |
| <200 | 116 | 38.72 ± 10.23 | 40.86 ± 10.47 | 2.14 ± 8.09 | 0.69 | <.001 |
| ≥200 | 182 | 35.90 ± 8.98 | 37.15 ± 10.34 | 1.25 ± 7.26 | 0.73 | <.001 |
| ∗Z = 0.67, P = .50 |
Comparison of correlation coefficients under different oxygenation indexes.
PaCO2 = arterial carbon dioxide tension, PETCO2 = end-expiratory carbon dioxide partial pressure.
