Table 3. Mean adjusted^† social functioning scores across disorders compared with healthy controls.

	Schizophrenia patients N = 56	Younger healthy controls N = 29	p-value	Effect size Cohen’s d	Alzheimer’s disease patients N = 50	Older healthy controls N = 28	p-value	Effect size Cohen’s d
Behavioral social functioning indicators
Social withdrawal, mean (SE)	10.4 (0.5)	13.3 (0.6)	<0.001	1.30	12.3 (0.5)	13.1 (0.6)	0.74	0.35
Interpersonal functioning, mean (SE)	6.4 (0.4)	8.5 (0.4)	<0.001	1.33	8.1 (0.4)	8.8 (0.4)	0.43	0.66
Independence-competence, mean (SE)	36.2 (0.7)	38.7 (0.8)	0.002	0.81	33.9 (0.8)	37.0 (0.8)	<0.001	1.06
Independence-performance, mean (SE)	29.4 (1.1)	34.6 (1.3)	<0.001	1.04	28.1 (1.2)	32.4 (1.3)	<0.001	0.96
Recreation activities, mean (SE)	19.3 (1.4)	24.5 (1.7)	0.002	0.81	23.2 (1.6)	28.3 (1.7)	0.002	0.83
Prosocial activities, mean (SE)	24.8 (2.1)	36.8 (2.6)	<0.001	1.25	28.6 (2.4)	34.5 (2.5)	0.030	0.65
Total SFS score, mean (SE)	111.2 (1.7)	125.3 (2.1)	<0.001	1.80	116.5 (1.9)	124.9 (2.0)	<0.001	1.14
Affective social functioning indicators
Perceived social disability, mean (SE)	11.3 (0.8)	6.1 (1.0)	<0.001	1.39	6.1 (0.9)	5.5 (1.0)	1.00	0.17
Rater-perceived social disability, mean (SE)	12.2 (0.8)	5.7 (1.0)	<0.001	1.69	10.5 (1.0)	6.0 (1.0)	<0.001	1.29
Loneliness, mean (SE)	4.6 (0.6)	0.4 (0.8)	<0.001	1.45	2.0 (0.7)	1.8 (0.8)	1.00	0.05

^† Adjusted for age, sex, years of education, partner status and country. Bonferroni adjustment for multiple comparisons.