Independent variables | Adjusted odds ratio | 95% confidence interval | P value |
Age ≥ 75 years | 3.41 | 1.31 - 8.87 | 0.012 |
Male sex | 2.21 | 0.71 - 6.94 | 0.173 |
Body mass index ≥ 25 kg/m2 | 2.61 | 1.07 - 6.40 | 0.036 |
Mallampati classification III or IV | 0.66 | 0.28 - 1.58 | 0.349 |