Table 4 Incidence of tracheal and vocal cord injuries (\(\bar x \pm s,\) n = 60)
Control group (n = 60) | Thermal softening group (n = 60) | Risk ratio (95% CI) | P | |
|---|---|---|---|---|
Tracheal injury | ||||
Severity | ||||
Mild | 35 (58%) | 38 (63%) | 1.08 (0.81 to 1.44) | 0.575 |
Moderate | 16 (27%) | 3 (5%) | 0.18 (0.05 to 0.61) | 0.001 |
Severe | 1 (1.7%) | 0 (0.0%) | 1.01 (0.98 to 1.05) | 0.315 |
Total incidence | 52(86.6%) | 41(68.3%) | 0.78 (0.64 to 0.96) | 0.016 |
Vocal cord injury | ||||
Edema | 14 (23%) | 12 (20%) | 0.85 (0.43 to 1.69) | 0.658 |
Erythema | 16 (26%) | 5 (8.3%) | 0.31 (0.12 to 0.79) | 0.008 |
Hematoma | 3 (5%) | 1 (1.7%) | 0.33 (0.04 to 3.11) | 0.309 |
Total incidence | 33 (55%) | 18 (30%) | 0.55 (0.35 to 0.86) | 0.006 |