Theory of mind deficits partly mediate impaired social decision-making in schizophrenia

BMC Psychiatry

Table 3 Mediation effects of ToM and neurocognition in the mini Ultimatum Game

Dependent variables	a	b	c	c’	ab	SE	Effect Size (ab/c)	95% C.I.
Dependent variables	a	b	c	c’	ab	SE	Effect Size (ab/c)	LL	UL
TMPST-Q
Hyper-unfair offer (8 vs. 2 / 10 vs. 0)	2.693	0.034	0.231	0.140^a	0.091	0.047	39%	0.026	0.211
Fair alternative (8 vs. 2 / 5 vs. 5)	2.693	0.031	0.218	0.134^a	0.083	0.049	38%	0.010	0.198
Hyper-fair alternative (8 vs. 2 / 2 vs. 8)	2.693	0.034	0.211	0.119^a	0.092	0.052	44%	0.013	0.211
Hyper-fair offer (8 vs. 2 / 2 vs. 8)	2693	−0.026	−0.172	−0.103^a	−0.070	0.042	41%	−0.179	-0.011
BACS-T
Hyper-unfair offer (8 vs. 2 / 10 vs. 0)	1.214	0.057^a	0.231	0.162^a	0.069	0.056	-	−0.036	0.188
Hyper-fair offer (8 vs. 2 / 2 vs. 8)	1.214	−0.047^a	−0.172	−0.116^a	−0.057	0.047	-	−0.187	0.014
TMPST-Q + BACS-T
Hyper-unfair offer (8 vs. 2 / 10 vs. 0)	2.693	0.031	0.231	0.119^a	0.112	0.055	48%	0.005	0.221
Hyper-fair offer (8 vs. 2 / 2 vs. 8)	2.693	−0.023	−0.172	−0.084^a	−0.089	0.054	52%	−0.214	−0.006

a, effect of X on M; b, effect of M on Y; c, total effect of X on Y; c’, direct effect of X on Y; ab, mediation effect; SE, standard error of estimation of ab; C.I., confidence interval of ab; TMPST-Q, questionnaire scores from the Theory of Mind Picture Stories Task; BACS-T, composite scores from the Brief Assessment of Cognition in Schizophrenia Scale.
^a P > 0.05

ISSN: 1471-244X