Table 1.
Mean onset and offset phonation threshold flow and RPTF in all larynges according to elongation group. For each elongation group, mean onset PTF was greater than mean offset PTF, and the onset-offset ratio (RPTF) was bound by the theoretically predicted range [0.707, 1.0].
| Elongation Level | Mean Onset PTF | Mean Offset PTF | Mean RPTF |
|---|---|---|---|
| +0% | 344.14 mL/s | 287.34 mL/s | 0.835 ± 0.137 |
| +5% | 222.78 mL/s | 182.02 mL/s | 0.817 ± 0.146 |
| +10% | 363.11 mL/s | 276.57 mL/s | 0.762 ± 0.0869 |
| +15% | 505.24 mL/s | 379.75 mL/s | 0.752 ± 0.0987 |