Skip to main content

Table 3 Acoustic parameters of the normal and stuttering groups

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

Parameters Normal group
n= 40
Stuttering group
n= 40
Test of significance
I- Prolonged /a/ vowel Fundamental Frequency (F0) 269.3 ± 36.8
(210–358.7)
272.1 ± 37.6
(207.8–362.8)
t= 0.35
P= 0.73
Jitter 0.43
(0.2–0.82)
0.51
(0.23–2.4)
Z= 2.4
P= 0.02*
Shimmer 4.5
(2.6–8.1)
5.3
(1.3–12.1)
Z= 2.1
P= 0.04*
Harmonic to Noise ratio (H/N ratio) 18.9 ± 2.4
(15.2–25.7)
17.6 ± 4.0
(8.9–25.0)
t=1.8
P= 0.08
II- Automatic speech Fundamental Frequency (F0) 260.3 ± 33.9
(195.3–373.3)
256.2 ± 37.3
(176.4–336.1)
t=0.51
P= 0.61
Jitter 1.6 ± 0.5
(0.98–2.9)
1.6 ± 0.5
(0.8–2.6)
t=0.41
P= 0.69
Shimmer 8.0 ± 1.8
(4.8–12.4)
8.7 ± 2.7
(4.7–12.9)
t=1.3
P= 0.21
Harmonic to Noise ratio (H/N ratio) 13.1 ± 1.8
(9.9–17.4)
13.1 ± 3.0
(8.4–19.9)
t= 0.08
P= 0.94
III- Spontaneous speech Fundamental Frequency (F0) 276.1 ± 33.3
(205.7–365.2)
276.4 ± 45.4
(158.0–336.1)
t=0.04
P= 0.97
Jitter 1.7 ± 0.5
(1.0–3.0)
1.7 ± 0.4
(0.74–2.9)
t=0.06
P= 0.95
Shimmer 8.2
(4.6–14.9)
8.2
(1.6–14.8)
Z=0.17
P= 0.86
Harmonic to Noise ratio (H/N ratio) 13.6 ± 2.2
(10.1–18.0)
13.8 ± 3.0
(8.5–19.7)
t=0.40
P= 0.69
  1. Data expressed as mean ± SD or median (minimum–maximum)
  2. *Significant p ≤ 0.05
  3. t, independent samples t-test
  4. Z, Mann-Whitney test