Table 7 The robustness test results after expanding the sample size.
Variable | (1) | (2) | ||
|---|---|---|---|---|
β | ME | β | ME | |
Provincial-pooling of URRBMI | 0.650** (0.211) | 0.095*** (0.031) | 0.576** (0.250) | 0.084** (0.036) |
Control variables | no | yes | ||
Region fixed effect | yes | yes | ||
Time fixed effect | yes | yes | ||
Observation | 9816 | 7662 | ||