. 2018 Dec 10;61(12):2837–2853. doi: 10.1044/2018_JSLHR-S-17-0356

Table 5.

Effect sizes (r) for Mann–Whitney U contrasts examining differences between the typically developing (TD), borderline, Dysarthria 1 (DYS1), and Dysarthria 2 (DYS2) clusters on the six speech measures and overall intelligibility.

Speech measure	Effect sizes (r) for pairwise contrasts
Speech measure	TD vs. borderline	TD vs. DYS1	TD vs. DYS2	Borderline vs. DYS1	Borderline vs. DYS2	DYS1 vs. DYS2
Proportion of bursts produced	.40	.27	.51 ^*	.19	.20	.10
F2 range of diphthongs (Hz)	.01	.34	.45 ^*	.40	.41	.07
Nasality rating	.16	.55 ^*	.65 ^*	.43 ^*	.50 ^*	.43 ^*
Proportion of deviant voice quality	.49 ^*	.04	.36	.46 ^*	.19	.28
Proportion of closure interval with voicing	.15	.04	.23	.13	.07	.19
Articulation rate (syll/s)	.40	.43 ^*	.64 ^*	.08	.45 ^*	.43 ^*
Overall intelligibility (%)	.39	.56 ^*	.65 ^*	.43 ^*	.50 ^*	.26

Note. A large effect size is .5, a medium effect size is .3, and a small effect size is .1 (Cohen, 1992). Significant contrasts are indicated in bold and with an asterisk.

p ≤ .008.