Table 5.
Decomposition analysis of concentration index on respondents’ health services utilization before and after policy
| Variables | Outpatient | Inpatient | ||||||
|---|---|---|---|---|---|---|---|---|
| Before policy | After policy | Before policy | After policy | |||||
| Contribution to CI | % | Contribution to CI | % | Contribution to CI | % | Contribution to CI | % | |
| CI | -0.0636 | 100 | -0.0457 | 100 | -0.0532 | 100 | -0.1105 | 100 |
| Needs variables | -0.0352 | 55.0997 | -0.0286 | 62.4756 | -0.0466 | 87.5468 | -0.0510 | 46.0528 |
| Economic status | -0.0138 | 21.8262 | -0.0104 | 22.8630 | 0.0001 | -0.2523 | -0.0150 | 13.6533 |
| Other variables | -0.0032 | 4.9824 | 0.0046 | -9.8942 | -0.002 | 3.9403 | -0.0138 | 12.4353 |
| Residuals | -0.0114 | 18.0917 | -0.0113 | 24.5556 | -0.0047 | 8.7652 | -0.0307 | 27.8586 |
| HI | -0.0284 | - | -0.0171 | - | -0.0066 | - | -0.0595 | - |
CI Concentration Index, % Pure percentage contributions of determinants to the socioeconomic inequality in inpatient health services utilization; Needs variables include sex, age, disability, pain and chronic diseases, other variables include education, living, smoking and drinking status, the detailed values of Contribution to CI and pure percentage for each variable are shown in the additional files 1 and 2, HI Horizontal inequity index.