Table 1.

T-tests results with t- and P-values inside each group before and after stimulation

Tests	Institutionalized			Noninstitutionalized
	Before stimulation vs after 24 sessions	After 24 sessions vs after 48 sessions	Before stimulation vs after 48 sessions	Before stimulation vs after 24 sessions	After 24 sessions vs after 48 sessions	Before stimulation vs after 48 sessions
Boston Naming	t=−6.0966	–	t=−5.7469	t=−4.0157	–	t=−3.1168
	P<0.0001		P<0.0001	P=0.001		P=0.0066
SVF	t=−9.4061	t=−5.7162	t=−12.959	–	t=−2.3952	t=−2.7531
	P<0.0001	P<0.0001	P<0.0001		P=0.0291	P=0.0141
PVF	t=−8.2193	t=−3.1762	t=−7.522	t=−4.718	–	t=−3.0514
	P<0.0001	P=0.004	P<0.0001	P<0.0001		P=0.0076
Key concepts (test of narrative)	t=−2.179	–	t=−3.3333	–	–	–
	P=0.0393		P=0.0028
Metaphors (explanation)	t=−6.8446	t=−3.3864	t=−7.8527	t=−3.3119	t=−3.4136	t=−4.3605
	P<0.0001	P=0.0024	P<0.0001	P=0.0044	P=0.0035	P<0.0001
DSA (explanation)	t=−6.831	t=−5.0761	t=−10.453	–	t=−2.2618	t=−3.4267
	P<0.0001	P<0.0001	P<0.0001		P=0.0379	P=0.0034
DSA (alternatives)	t=−3.1569	–	t=−3.9489	–	–	–
	P=0.0042		P=0.0006
ISA (explanation)	t=−6.4679	t=−4.9609	t=−9.4186	t=−3.1158	–	t=−4.77
	P<0.0001	P<0.0001	P<0.0001	P=0.0066		P<0.0001
Emotional	t=−7.0081	–	t=−5.4436	–	t=−2.6648	t=−2.3451
Prosody	P<0.0001		P<0.0001		P=0.0169	P=0.0322
Partial retelling	t=−6.5338	t=−2.522	t=−6.0136	–	t=−2.4874	–
	P<0.0001	P=0.0187	P<0.0001		P=0.0242
Total retelling	t=−2.8284	t=−6.1954	t=−4.9847	t=−3.732	t=−2.4245	t=−4.4362
	P=0.0093	P<0.0001	P<0.0001	P=0.0018	P=0.0275	P<0.0001
Comprehension	t=−3.9192	–	t=−5.2553	–	–	t=−2.3154
	P=0.0006		P<0.0001			P=0.0341

Abbreviations: MMSE, mini-mental state examination; SVF, semantic verbal fluency; PVF, phonological verbal fluency; Expl, explanation; DSA, direct speech acts; ISA, indirect speech acts.