Table 1 Summary of the studied speech measures by speech task.

		Diadochokinetic-AMR	Diadochokinetic-SMR	Read	Spontaneous
Consonant production measures
CoV of voiceless stop VOTs	CHR	0.31 (0.09)	0.39 (0.1)	0.43 (0.1)	0.4 (0.09)
	HC	0.27 (0.1)	0.35 (0.09)	0.39 (0.07)	0.4 (0.07)
	p	0.05	0.02	0.03	0.73
CoV of voiced stop VOTs	CHR			0.7 (0.26)	0.66 (0.26)
	HC			0.71 (0.26)	0.58 (0.31)
	p			0.67	0.18
Speech rate measures
CoV of speech rate	CHR	0.07 (0.04)	0.1 (0.05)	0.2 (0.05)	0.43 (0.45)
	HC	0.05 (0.04)	0.08 (0.04)	0.18 (0.06)	0.37 (0.32)
	p	<0.01	0.01	0.04	0.52
Vowel production measures
CoV of vowel durations	CHR	0.2 (0.09)	0.43 (0.12)	0.56 (0.05)	0.74 (0.11)
	HC	0.17 (0.09)	0.4 (0.15)	0.56 (0.06)	0.73 (0.09)
	p	0.13	0.18	0.42	0.72
Formant dispersion 20%	CHR	158.63 (86.4)	211.7 (85.72)	341.76 (53.41)	357.52 (48.52)
	HC	128.85 (64.57)	185.02 (75.8)	332.5 (48.44)	362.32 (58.29)
	p	0.03	0.08	0.33	0.77
Change in formant dispersion 20–50%	CHR	14.59 (21.02)	20.33 (20.06)	−22.07 (14.82)	−4.5 (16.36)
	HC	10.68 (20.01)	19.41 (19.17)	−21.99 (15.2)	−2.06 (17.79)
	p	0.33	0.81	0.98	0.48
Overlap between vowel categories	CHR			0.8 (5.91)	0 (0)
	HC			0 (0)	0 (0)
	p			0.64	0.45
Timing/pausing measures
CoV of syllable durations	CHR	0.21 (0.09)	0.39 (0.1)
	HC	0.17 (0.08)	0.36 (0.13)
	p	0.11	0.1
CoV of intersyllable durations	CHR	0.42 (0.25)	0.9 (0.27)
	HC	0.34 (0.18)	0.82 (0.23)
	p	0.05	0.17
Number of pauses	CHR			0.1 (0.03)	0.15 (0.05)
	HC			0.09 (0.03)	0.14 (0.07)
	p			0.13	0.4

For each speech measure/speech task combination, the table provides descriptive statistics [mean (standard deviation)] by group (CHR vs. HC), as well the p-value corresponding to the CHR vs. HC group difference test. Blank cells indicate that the speech measure in question was not calculated for the speech task in question. Measures are bolded if they show a significant CHR vs. HC group difference and italicized if just above significance. CoV coefficient of variation, VOT voice-onset-time.

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