Table 2.

Heterogeneity comparison between sample 1 and sample 2

	Sample 1	Sample 2	P
Sample size (n, %)	1801 (100.0)	1800 (100.0)	-
Age (y, mean ± sd)	66.6 ± 7.1	66.7 ± 7.1	0.6764†
Gender (n, %)
Male	791 (43.9)	821 (45.6)	0.3075‡
Female	1010 (56.1)	979 (54.4)
GDS-30 score (P50, (P25, P75))	4 (2, 9)	4 (2, 9)	0.7011§
Depressive symptoms (n, %)
No	1626 (90.3)	1641 (91.2)	0.8870‡
Yes	175 (9.7)	159 (8.8)

^†Independent-samples t-test

^‡Chi-square test

^§Mann-Whiteney U test