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Table 4 Mechanism of change—phonatory measures for human speakers

From: Speaking with a KN95 face mask: a within-subjects study on speaker adaptation and strategies to improve intelligibility

 

Mask only

No mask

 

Mean

SD

Mean

SD

Low frequencies (dB)

77.20

5.07

76.82

4.04

High frequencies (dB)

36.24

5.53

38.78

4.82

Low/high ratio (dB)

40.96

4.39

38.04

4.82

Duration (s)

19.63

9.32

20.33

9.78

F0 (Hz)

189.60

43.93

184.32

45.24

Shimmer (%)

0.04

0.01

0.04

0.01

Jitter (%)

0.004

0.001

0.004

0.002

HNR (dB)

22.26

3.14

21.01

2.70

 

Female speakers

Male speakers

F0 (Hz)

209.30

24.51

124.39

16.71

  1. Descriptive statistics mean and standard deviation (SD) for phonatory measures produced by humans. Low frequencies: 80 Hz–4 kHz; High frequencies: 4–10 kHz