Table 2 Heterogeneity comparison between sample 1 and sample 2

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)