TABLE 4.

T score of discourse measures and group differences among aMCI, naMCI, and healthy control participants.

	Measures	aMCI	naMCI	HC	HC-aMCI	HC-naMCI	naMCI-aMCI
Coherence	Global coherence	45.41	48.90	55.88	10.47	6.98	3.50
	Local coherence	46.61	50.44	53.76	7.15	3.32	3.83
Cohesion	Proportion of cohesive words	42.94	49.64	55.68	12.74	6.04	6.70
	Proportion of cohesive morphemes	48.60	47.18	53.31	4.71	6.13	–1.42
	Cohesive ties per utterance	46.30	48.83	53.99	7.69	5.16	2.53
Proposition	Propositional density	44.26	50.63	56.33	12.08	5.71	6.37
Grammaticality	Proportion of clausal endings	48.92	47.04	53.29	4.37	6.25	–1.89
	MLU	50.04	50.90	49.39	–0.65	–1.51	0.85
Lexicality	Proportion of nouns	47.74	52.05	52.19	4.45	0.14	4.31
	Proportion of verbs	48.69	47.35	53.23	4.54	5.88	–1.34
	NDW	50.33	50.91	49.27	–1.06	–1.64	0.58
	TTR	49.37	50.67	50.31	0.94	–0.35	1.29
Fluency	Proportion of dysfluencies	54.33	51.24	43.95	−10.38	−7.29	–3.09
	Speech rate	48.85	50.67	52.67	3.83	2.00	1.82
	Proportion of pauses	54.15	52.50	43.08	−11.07	−9.42	–1.65

aMCI, amnestic mild cognitive impairment; naMCI, non-amnestic MCI; HC, healthy control. MLU, mean length of utterances; NDW, number of different word; TTR, type token ratio. Statistically significant differences are highlighted with bold letters.