Table 4.
Observed and predicted prevalence of poor health, rate difference and rate ratio for low and high educated groups with and without the implementation of the policy, as obtained using the seven methods
| Low-educated (%) | High-educated (%) | Rate difference | Rate ratio | |
|---|---|---|---|---|
| Observed prevalence with policy effect | 16.63 | 7.49 | 9.14 | 2.22 |
| Predicted prevalence without the policy effecta | ||||
| Regression adjustment | 19.11 | 8.00 | 11.11 | 2.39 |
| Propensity score matching | 19.03 | 7.99 | 11.04 | 2.38 |
| Difference-in-differences analysis | 18.97 | 7.98 | 10.99 | 2.38 |
| Fixed effects models | 18.84 | 7.88 | 10.96 | 2.39 |
| Instrumental variable analysis | 19.15 | 7.99 | 11.16 | 2.40 |
| Regression discontinuity | Not comparable | Not comparable | Not comparable | Not comparable |
| Interrupted time-series | 18.96 | 7.97 | 10.99 | 2.38 |
aAs derived from the stratified analyses, reported as proportion of individuals with poor health (or, equivalently, individual probability of having poor health)