Table 3 Analysis of the results of covariates
Variable | HR | 95% CI | p-Value |
|---|---|---|---|
Shapes of stylet (banana vs. straight-to-cuff) | 0.99 | 0.82–1.20 | 0.950 |
Lifting of epiglottis | 1.68 | 1.34–2.11 | < 0.001 |
Holding level of tube (middle vs. top) | 1.04 | 0.86–1.26 | 0.675 |
Duration of service | 1.00 | 0.96–1.04 | 0.945 |
Height of the participant | 1.09 | 0.97–1.05 | 0.631 |