TABLE 2.
Time trends in the SII and CIX by country income groups: 1993–20141
| SII | CIX | |||
|---|---|---|---|---|
| Income group (World Bank) | Slope ± SE | P 2 | Slope ± SE | P 2 |
| Global | 0.06 ± 0.17 | 0.690 | 0.04 ± 0.16 | 0.822 |
| Low-income | −0.21 ± 0.09 | <0.001 | −0.22 ± 0.05 | <0.001 |
| Middle-income | 0.26 ± 0.29 | 0.371 | −0.07 ± 0.28 | 0.807 |
| P 3 | 0.135 | 0.322 | ||
1Slopes are based on linear regressions of SII and CIX over year of the survey and expressed in percentage points. CIX, Concentration Index of Inequality; SII, Slope Index of Inequality.
2 P values for slope being different from zero.
3 P values for interactions between country income groupings (low, middle) and year of the survey (expressed as slopes).