Table 4.
Results of endogenous test and robustness test.
| Variables | Endogenous test | Robustness test | ||||
|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | |
| ADLS | −0.8447*** (0.0686) |
−1.7437*** (0.1462) |
||||
| Sick_1 | −0.5542*** (0.0392) |
−0.2445*** (0.0742) |
||||
| Sick_2 | −0.2348*** (0.0142) |
−0.0966** (0.0394) |
||||
| _cons | 0.4058*** (0.0168) |
0.3972*** (0.0192) |
0.3182*** (0.0157) |
|||
| Control variables | Yes | Yes | Yes | Yes | Yes | Yes |
| Year control | Yes | Yes | Yes | Yes | Yes | Yes |
| Individual cnotrol | Yes | Yes | Yes | Yes | Yes | Yes |
| Observations | 20,256 | 20,256 | 20,256 | 20,256 | 20,256 | 20,256 |
Due to space limitations, this study only reports the second-stage regression results. ***p ≤ 0.01, **p ≤ 0.05.