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| Acoustic measures | Mean | s.d. | Minimum | Maximum |
| F1 | 245.7 | 21.5 | 212.0 | 318.5 |
| F2 | 484.5 | 32.9 | 409.0 | 564.0 |
| F3 | 734.2 | 71.7 | 592.5 | 917.5 |
| F4 | 1202.8 | 71.0 | 1066.5 | 1310.5 |
| F5 | 1663.5 | 85.7 | 1490.0 | 1826.5 |
| F6 | 2156.1 | 109.1 | 1961.5 | 2361.0 |
| ΔF | 367.0 | 14.1 | 344.8 | 399.5 |
