Table 7.

Average AUC (in bold), sensitivity, and specificity based on the five cross-validation folds of the univariate (i.e., only including individual features) and multivariate (i.e., including all features) LDAs for the clinical groups as a whole and for each group individually.

	ALS	PA	PD	nfPPA+PAOS	Average AUC for All Clinical Groups	Comparison of Average AUCs for All Clinical Groups
Coord	.69, .62, .79	.57, .67, .58	.70, .74, .69	.88, .88, .85	.71	Coord-All Features	p < .05*
Con	.55, .66, .55	.75, .76, .74	.74, .79, .66	.39, .53, .52	.61	Con-All Features	p < .001***
Speed	.36, .41, .51	.53, .66, .50	.54, .60, .63	.63, .80, .58	.52	Speed-All Features	p < .001***
Prec	.56, .73, .51	.43, .39, .67	.63, .67, .64	.69, .73, .69	.58	Prec-All Features	p < .001***
Rate	.45, .54, .54	.67, .69, .66	.74, .79, .66	.91, .93, .85	.69	Rate-All Features	p < .05*
All Features	.64, .64, .66	.80, .75, .82	.83, .82, .78	.95, .88, .96	.81

Note. ALS = amyotrophic lateral sclerosis; PA = progressive ataxia; PD = Parkinson’s disease; nfPPA+PAOS = the nonfluent variant of primary progressive aphasia and progressive apraxia of speech.