Table 6 Comparison between the measures of voice parameters with face mask and without face mask
From: The effect of wearing face masks on voice and intelligibility of speech during the COVID-19 pandemic
| Â | With face mask | Without face mask | P value | ||
|---|---|---|---|---|---|
Mean | SD | Mean | SD | ||
Absolute jitter | 51.72 | 33.83 | 49.03 | 41.53 | 0.102 |
Shimmer in dB | 0.27 | 0.16 | 0.26 | 0.21 | 0.001* |
Noise to harmonic ratio (N/H ratio) | 0.13 | 0.02 | 0.13 | 0.03 |  < 0.001* |
Mean fundamental frequency (MFF) | 179.36 | 53.73 | 177.64 | 53.39 | 0.013* |
Maximum phonation time (MPT) | 14.16 | 5.11 | 14.85 | 4.96 |  < 0.001* |