Table 2 Difference-in-differences estimation in mean, CI and GCI of drug expenditure
From: The impact of Medicare part D on income-related inequality in pharmaceutical expenditure
| Â | DID in mean drug expenditure | DID in drug expenditure CI | DID in drug expenditure GCI | ||||
|---|---|---|---|---|---|---|---|
Standardisation | Standardisation | ||||||
None | Direct | Indirect | None | Direct | Indirect | ||
Total | 77.1 (0.820) | −0.007 (−0.247) | −0.010 (− 0.354) | −0.007 (− 0.271) | 5.506 (0.107) | 0.859 (0.017) | 4.612 (0.098) |
 OOP | − 285.7c (−7.541) | −0.005 (− 0.118) | 0.010 (0.251) | 0.011 (0.277) | 3.738 (0.147) | 7.063 (0.290) | 6.018 (0.267) |
 Public | 622.2c (14.155) | 0.117b (2.810) | 0.107a (2.375) | 0.107a (2.573) | 50.413a (2.006) | 68.255b (2.999) | 66.254b (3.121) |
 Private | −259.4c (−3.868) | 0.040 (0.667) | 0.030 (0.536) | 0.027 (0.527) | −48.646 (−1.525) | −74.460a (−2.177) | −67.659a (− 2.192) |