Table 2 Effects indicated by the regression coefficients
| Difference between before and during the intervention | Difference between during and after the intervention | Difference between before and after the intervention | |
|---|---|---|---|
| Coefficient for the treatment group | -β4 − β5 | +β2 + β3 | +β2 + β3 − β4 − β5 |
| Coefficient for the control group | -β5 | +β2 | +β2 − β5 |
| Difference between the treatment and control groups | -β4 (the rectification effect) | +β3 (the health improvement effect) | -β4 + β3 (both effects on costs) |
