Comparison of post-nasal space noise levels
| 0.2 kHz | 0.5 kHz | 1 kHz | 2 kHz | 4 kHz | 6 kHz | 8 kHz | |
|---|---|---|---|---|---|---|---|
| Values are mean (SEM). | |||||||
| CPAP, Continuous positive airways pressure. | |||||||
| No respiratory support v conventional ventilation | |||||||
| No respiratory support (5 subjects) | 46.82 (3.52) | 38.22 (3.85) | 33.66 (3.62) | 31.02 (1.36) | 29.94 (3.09) | 33.00 (2.06) | 38.52 (1.62) |
| Conventional ventilation (5 subjects) | 55.52 (3.93) | 54.26 (3.87) | 50.26 (3.58) | 45.24 (2.34) | 39.02 (4.1) | 37.80 (3.0) | 40.38 (0.95) |
| p Value | 0.138 | 0.019 | 0.011 | 0.001 | 0.115 | 0.228 | 0.35 |
| Conventional ventilation v CPAP support | |||||||
| Conventional ventilation (5 subjects) | 55.52 (3.93) | 54.26 (3.87) | 50.26 (3.58) | 45.24 (2.34) | 39.02 (4.1) | 37.80 (3.0) | 40.38 (0.95) |
| CPAP support (6 subjects) (flow rate 5 litres/min) | 86.56 (6.37) | 86.43 (5.54) | 88.75 (6.82) | 76.43 (6.72) | 80.48 (7.56) | 79.68 (6.87) | 72.41 (5.73) |
| p Value | 0.003 | 0.001 | 0.001 | 0.003 | 0.001 | 0.001 | 0.001 |