Table 4.
Comparisons of the secondary outcomes (N = 260)
| Group | Estimatea | 95% CI | P |
|---|---|---|---|
| Success on two attempts | |||
| Bougie first vs. Preloaded bougie | 3.00 | 0.31 to 28.84 | 0.341 |
| Bougie first vs. ETT with stylet | 2.00 | 0.18 to 22.06 | 0.571 |
| Bougie first vs. ETT without stylet | 10.00 | 1.28 to 78.12 | 0.028* |
| Duration of the first attempt (s) | |||
| Bougie first vs. Preloaded bougie | 1.62 | 1.28 to 2. 04 | < 0.001* |
| Bougie first vs. ETT with stylet | 0.96 | 0.64 to 1.44 | 0.832 |
| Bougie first vs. ETT without stylet | 2.09 | 1.51 to 2.89 | < 0.001* |
| Overall intubation duration (s) | |||
| Bougie first vs. Preloaded bougie | 1.61 | 1.28 to 2.01 | < 0.001* |
| Bougie first vs. ETT with stylet | 1.04 | 0.68 to 1.58 | 0.864 |
| Bougie first vs. ETT without stylet | 2.12 | 1.54 to 2.91 | < 0.001* |
| Self-reported intubation difficulty | |||
| Bougie first vs. Preloaded bougie | -0.86 | -1.57 to -0.15 | 0.018* |
| Bougie first vs. ETT with stylet | -0.02 | -0.72 to 0.69 | 0.966 |
| Bougie first vs. ETT without stylet | -3.18 | -3.89 to -2.48 | < 0.001* |
Abbreviations: CI, confidence interval; ETT, endotracheal tube. aSuccess on two attempts was analyzed by a generalized estimating equation logistic model. Duration of the first attempt and overall intubation duration were analyzed by Cox regression model including a cluster term of residents. Self-reported intubation difficulty was analyzed by a linear mixed-effects model. The estimates were risk ratio for logistic model, hazard ratio for Cox model, and mean difference for linear model. *P < 0.005