Table 5.

Median values of rate and prosody measures across the three speech samples and statistical group comparisons.

Variable	nfvPPA	lvPPA	p	AUC
Motor speech examination
Word syllable duration (ms)	356.1	260.7	.003*	.880
Pairwise variability index	6.2	23.2	.243	.667
Scanning index	.919	.893	.035*	.780
Western Aphasia Battery Picture Description
Word syllable duration (ms)	388.4	198.3	.001**	.926
Narrative syllable duration (ms)	425.7	260.9	< .001***	1.000
Pairwise variability index	50.8	53.1	.353	.630
Scanning index	.652	.468	.043*	.770
Cinderella story telling
Word syllable duration (ms)	442.1	210.4	.010*	.875
Narrative syllable duration (ms)	360.1	223.0	.002**	.938
Pairwise variability index	59.1	70.1	.010*	.875
Scanning index	.799	.650	.010*	.875

Note. Group comparisons were completed using the Mann–Whitney U statistic. AUC indicates area under the receiver operating curve for differentiating nfvPPA from lvPPA with clinical diagnosis as the reference standard.

^* p < .05.

^** p < .01.

^*** p < .001.