Table 1 Comparison of capnograph-derived PCO2s in different measurements between ventilated patients with hook method, T/E method and E/C technique
Measurement time | Technique used for ventilation | p-value | Group effect p-value | Time effect p-value | ||
|---|---|---|---|---|---|---|
T/E method Median (IQR*) | E/C method Median (IQR) | Hook method Median (IQR) | ||||
The 2nd second | 20 (20–23) | 21(22 − 20) | 21 (20–22) | 0.199 | 0.006** | < 0.001** |
The third second | 24 (22–25) | 23(24 − 21) | 23 (23–24) | 0.114 | ||
The fourth second | 24 (22–26) | 25(26 − 23) | 25 (24–26) | 0.071 | ||
The fifth second | 26(24–27) | 26(28 − 24) | 26 (25–27) | 0.008 | ||
The sixth second | 25 (23–27) | 28(29 − 25) | 27 (26–28) | < 0.001 | ||
The seventh second | 26(24–29) | 29(30 − 27) | 28 (27–29) | < 0.001 | ||
The eight second | 28(26–30) | 30(31 − 29) | 29 (28–30) | < 0.001 | ||
The ninth second | 29 (25.27-31) | 31(33 − 29) | 30 (28–31) | 0.134 | ||
The tenth second | 31(29–34) | 32(34 − 30) | 31 (29–32) | 0.377 | ||