Table 3.

Summary of quantitative acoustic and kinematic speech measures.

Group	Case	Syndrome dx	Mean |z|, all features	Mean |z|, shared features	Mean |z|, AOS features	Mean |z|, dysarthria features	Quantitative MSI predominance (AOS + , Dys + ) a
MSI−	1	lvPPA	0.64	0.56	0.68	0.87	—
	2	lvPPA	0.70	0.55	1.05	0.72	—
	3	lvPPA	1.24	1.94	0.78	0.34	—
	4	lvPPA	1.75	2.51	1.47	0.43	—
	5	lvPPA	0.91	0.87	1.04	0.89	—
	6	lvPPA	0.84	1.13	0.46	0.48	—
	7	lvPPA	1.59	2.15	1.24	0.98	—
	8	lvPPA	1.20	1.18	1.59	0.87	—
	9	lvPPA	1.05	0.89	1.39	1.00	—
Group M (SD), MSI−			1.15 (0.93)	1.31 (1.00)	1.01 (0.8)	0.74 (0.57)	—
MSI+	10	PPAOS	1.64	2.64	0.16	1.08	Dys+
	11	nfvPPA	2.51	3.34	2.67	2.23	AOS+
	12	CBS	1.48	1.31	3.43	1.98	AOS+
	13	PSP	0.95	1.26	0.32	1.20	Dys+
	14	nfvPPA	1.85	2.76	1.40	1.18	AOS+
	15	PSP	2.46	3.63	0.68	1.43	Dys+
	16	PPAOS	2.61	4.46	1.30	0.34	AOS+
	17	PPAOS	2.16	3.60	1.01	0.77	AOS+
	18	PPAOS	2.48	3.77	1.41	1.04	AOS+
	19	CBS	3.76	4.74	3.52	2.21	AOS+
	20	nfvPPA	3.94	4.98	3.18	8.38	Dys+
Group M (SD), MSI+			2.64 (1.85)	3.30 (1.81)	1.46 (1.29)	1.38 (1.13)	—

Note. Em dashes indicate data not reported. dx = diagnosis; AOS = apraxia of speech; Dys = dysarthria; lvPPA = logopenic variant primary progressive aphasia; MSI+ = motor-speech–impaired group of individuals with nfvPPA, PPAOS, CBS, or PSP and suspected four-repeat tauopathy pathology; PPAOS = primary progressive apraxia of speech; MSI− = non–motor-speech-impaired group of individuals with logopenic variant primary progressive aphasia; nfvPPA = nonfluent variant primary progressive aphasia; CBS = corticobasal syndrome; PSP = progressive supranuclear palsy.

^a Predominant impairment based on quantitative speech measures, rated for the MSI+ group only. Predominance determined from a ratio of mean |z|, AOS features to mean |z|, dysarthria features. AOS ⁺ (|z|_AOS > |z|_dys) indicates predominant apraxic impairment; Dys ⁺ (|z|_dys > |z|_AOS) indicates predominant dysarthric impairment.