Table 1 Correlation among demographic variables, depressive symptoms, brain volume, and social network.

	Variable	1	2	3	4	5	6	7	8	9	10
1	Gender^a
2	Age	0.09
3	Education	0.52	−0.27**
4	Depressive symptoms	−0.03	0.23**	−0.18*
5	LTM Recall	−0.13	−0.33**	0.25**	−0.27**
6	LTM Recognition	−0.04	−0.32**	0.36**	−0.37**	0.70**
7	Brokerage	−0.11	−0.11	0.17	−0.05	0.08	0.17
8	Social network size	0.10	0.03	−0.05	0.01	−0.09	−0.20	−0.63**
9	Left hippocampus volume	0.14	−0.37**	0.26*	−0.29*	0.17	0.30*	0.12	−0.09
10	Right hippocampus volume	0.08	−0.46**	0.22	−0.27*	0.21	0.35**	0.16	−0.11	0.79**
11	Intracranial volume	0.54**	−0.12	0.52**	−0.27*	0.06	0.18	0.15	−0.02	0.56**	0.51**

Note. Correlation represent Pearson’s correlation except for gender; ^aSpearman correlation coefficient represented for gender variable.
Depressive symptoms: Geriatric Depression Scale (GDS) total score; LTM: Long-Term Memory; Brokerage: Social network structural constraint (range 0–1), a smaller value indicates a larger opportunity for brokerage; Social network size: number of social ties in the global network.
**p < 0.001, *p < 0.05, 2-tailed.

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