Table 3. Comparisons of Parameters between Normocapnia and Hypercapnia Group.
| Parameters | Normocapnia (n=105) | Hypercapnia (n=112) | p value |
|---|---|---|---|
| Frequency, mean (±SD, Hz) | 11.2 (±1.2) | 10.9 (±1.1) | 0.035 |
| Amplitude, mean (±SD, cm H2O) | 24.6 (±6.2) | 23.7 (±4.2) | <0.001 |
| MAP, mean (±SD, cm H2O) | 11.9 (±5.3) | 12.1 (±4.8) | <0.018 |
| FiO2, mean (±SD) | 0.32 (±0.16) | 0.49 (±0.14) | <0.001 |
| Tidal volume, mean (±SD, mL/kg) | 2.1 (±0.5) | 1.6 (±0.3) | <0.001 |
| Minute volume, mean (±SD, mL/kg) | 0.9 (±0.2) | 0.6 (±0.3) | <0.001 |
| DCO2, mean (±SD, mL2/sec) | 68.4 (±32.7) | 32.4 (±15.7) | <0.001 |
| SpO2, mean (±SD, %) | 91.5 (±5.9) | 90.1 (±4.9) | 0.542 |
MAP, mean arterial pressure; FiO2, fraction of inspired oxygen; DCO2, carbon dioxide diffusion coefficient; SpO2, peripheral capillary oxygen saturation; SD, standard deviation.