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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