Table 3 The detection rate of depression in the elderly in different years
From: Factors affecting the evolution of Chinese elderly depression: a cross-sectional study
Depression a | 2011 | 2013 | 2015 | 2018 | Trend | χ2 | P value |
|---|---|---|---|---|---|---|---|
Total |  |  |  |  |  | 81.256 | < 0.001 |
 Yes | 1872(36.8) | 1876(38.7) | 2224(42.7) | 2822(44.5) | ↑ |  |  |
 No | 3209(63.2) | 2977(61.3) | 2983(57.3) | 3521(55.5) |  |  |  |
Add sample b | Â | Â | Â | Â | Â | 4.185 | 0.041 |
 Yes | – | 669(37.7) | 837(40.8) | 1309(41.1) | ↑ |  |  |
 No | – | 1104(62.3) | 1216(59.2) | 1877(58.9) |  |  |  |
Duplicate sample c |  |  |  |  |  | 45.972 | < 0.001 |
 Yes | 494(37.4) | 538(40.8) | 594(45.0) | 657(49.8) | ↑ |  |  |
 No | 826(62.6) | 782(59.2) | 726(55.0) | 663(50.2) |  |  |  |