| VARIABLES | Odds Ratio (Hospital Visit) |
| AQI | 0.9997 |
| (0.002) | |
| Urban | 0.5318** |
| (0.149) | |
| AQI*Urban | 1.0081** |
| (0.003) | |
| Constant | 0.2361*** |
| (0.052) | |
| Observations | 10835 |
| Number of area | 50 |