Table 3 Comparison of weight-standardized expiratory tidal volumes in patients not initially easy to mask ventilate
| Variable | Guedel vs. AOA | p-value |
|---|---|---|
| Expiratory tidal volume |
Mean diff = 0.397 (ml/kg) CI = (0.134 to 0.660) | |
| Inspiratory tidal volume |
Mean diff = − 0.041 (ml/kg) CI = (− 0.321 to 0.240) | |
| Ease of placement |
aOdds ratio = 0.312 CI = (0.012 to 8.285) | > 0.999 |
| Normal expiratory waveform |
Odds ratio = 1.536 CI = (0.238 to 9.926) | 0.65 |
| Blood on 1st device (Guedel 1st vs. 2nd) |
aOdds ratio = 5.769 CI = (0.232 to 143.371) | 0.47 |