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Perturbation analysis data: only voices with clear harmonic structure on sound spectrography underwent perturbation analysis. Mean, standard deviation and p values before and after voice therapy are reported. p values on Wilcoxon test are also reported.
| Before voice therapy | After voice therapy | p value | |
|---|---|---|---|
| Jitt% | 2.3 ± 1.27 | 1.9 ± 0.97 | 0.04 |
| Shim% | 4.8 ± 1.95 | 4.2 ± 1.29 | 0.06 |
| NHR | 0.13 ± 0.14 | 0.10 ± 0.02 | 0.04 |
| Fo | 186 ± 54.03 | 173 ± 42.7 | 0.64 |
