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The Egyptian Journal of Otolaryngology

Table 5 P1, P2, and P3 of within group comparison between acoustic parameters in the normal and stuttering groups

From: Acoustic characteristics of voice and speech in Arabic-speaking stuttering children

Items

P1

P2

P3

Normal group

Jitter

Z= 7.6

P ≤ 0.001*

Z= 7.7

P ≤ 0.001*

Z= 1.1

P= 0.28

Shimmer

Z= 7.2

P ≤ 0.001*

Z= 6.9

P ≤ 0.001*

Z= 1.2

P= 0.24

Harmonic to Noise ratio

≤ 0.001*

≤ 0.001*

0.31

Stuttering group

Jitter

Z= 6.3

P ≤ 0.001*

Z= 6.2

P ≤ 0.001*

Z= 0.76

P= 0.45

Shimmer

Z= 4.3

P ≤ 0.001*

Z= 4.1

P ≤ 0.001*

Z= 0.27

P= 0.79

Harmonic to Noise ratio

≤ 0.001*

≤ 0.001*

0.38

  1. P1, prolonged /a / vowel vs automatic speech; P2, prolonged /a / vowel vs spontaneous speech; P3, automatic speech vs spontaneous speech; Z, Mann-Whitney test
  2. Significant difference between groups regarding harmonic to noise ratio is done by post hoc LSD test
  3. *Significant p ≤ 0.05
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