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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