Table 2 Preoperative voice quality parameters
From: Influence of age on voice quality after transoral CO2 laser microsurgery
Voice quality outcomes | Preoperative | ||
|---|---|---|---|
 < 60 yo |  ≥ 60 yo | p-value | |
VHI | 47.2 ± 26.3 | 32.4 ± 26.9 | 0.008 |
GRBAS | |||
 Grade of dysphonia | 2.0 ± 0.8 | 1.9 ± 0.7 | NS |
 Roughness | 1.6 ± 0.8 | 1.7 ± 0.7 | NS |
 Breathiness | 1.5 ± 0.6 | 1.4 ± 0.7 | NS |
 Asthenia | 0.1 ± 0.1 | 0.1 ± 0.3 | NS |
 Strain | 1.4 ± 1.0 | 1.1 ± 0.9 | NS |
Acoustic measures | |||
 F0 (Hz) | 147.8 ± 44.3 | 157.4 ± 46.0 | NS |
 STD (Hz) | 5.6 ± 5.7 | 6.5 ± 7.8 | NS |
 Jitter (%) | 3.1 ± 2.3 | 3.1 ± 2.4 | NS |
 Shimmer (%) | 7.9 ± 4.9 | 7.9 ± 4.8 | NS |
 NHR | 0.2 ± 0.1 | 0.2 ± 0.1 | NS |
Maximum phonation time | 12.7 ± 5.3 | 13.1 ± 6.6 | NS |
Fluency | 142.8 ± 17.2 | 138.4 ± 22.5 | NS |
Mucosal wave | 2.3 ± 1.2 | 2.2 ± 1.1 | NS |