Contribution of independent factors to the concentration index (CIX) for health insurance coverage in the SSA region
| Elasticity | Individual CIX | Contribution to overall CIX | % contribution to overall CIX | |
| Age category 15–24 (reference) | ||||
| Age category 25–39 | 0.067 | 0.017*** (0.011 to 0.023) | 0.001 (0.001 to 0.002) | 0.32*** (0.21 to 0.43) |
| Age category 40–64 | 0.099 | −0.050*** (−0.057 to −0.043) | 0.005 (−0.006 to −0.004) | −1.40*** (−1.58 to −1.22) |
| Subtotal age | −0.004 | −1.08 | ||
| Not employed (reference) | ||||
| Informally employed | 0.127 | −0.241*** (−0.253 to −0.229) | −0.031 (−0.039 to −0.024) | −8.21*** (−9.99 to −6.43) |
| Formally employed | 0.059 | 0.294*** (0.280 to 0.308) | 0.020 (0.016 to 0.023) | 5.33*** (4.38 to 6.29) |
| Subtotal employment status | −0.011 | −2.88 | ||
| Gender (1=male) | −0.029 | 0.016*** (0.010 to 0.022) | 0.000 (−0.001 to 0.000) | −0.13*** (−0.18 to −0.08) |
| Residence (1=urban) | −0.012 | 0.778*** (0.761 to 0.794) | −0.010 (−0.042 to 0.028) | −2.56 (−9.67 to 4.54) |
| Marital status (1=married) | 0.073 | −0.176*** (−0.184 to −0.168) | −0.014 (−0.017 to −0.009) | −3.61*** (−4.63 to −2.60) |
| Exposure to media (1=exposed) | 0.455 | 0.452*** (0.438 to 0.465) | 0.221 (0.193 to 0.257) | 58.49*** (51.43 to 65.54) |
| Household size >5 (reference) | ||||
| Household size 4–5 | 0.062 | 0.024*** (0.014 to 0.033) | 0.002 (0.001 to 0.003) | 0.43*** (0.23 to 0.62) |
| Household size 1–3 | 0.056 | 0.080*** (0.069 to 0.092) | 0.005 (0.004 to 0.006) | 1.40*** (1.10 to 1.71) |
| Subtotal household size | 0.007 | 1.83 | ||
| No education (reference) | ||||
| Primary education | 0.047 | −0.181*** (-0.195 to −0.167) | −0.009 (-0.014 to −0.003) | −2.39*** (−3.95 to −0.84) |
| Secondary education | 0.264 | 0.384*** (0.371 to 0.396) | 0.111 (0.098 to 0.125) | 29.40*** (25.41 to 33.39) |
| Higher education | 0.082 | 0.665*** (0.637 to 0.693) | 0.067 (0.061 to 0.073) | 17.74*** (16.03 to 19.45) |
| Subtotal education | 0.169 | 44.75 | ||
| Poorest (reference) | ||||
| Poorer | −0.003 | −0.574*** (−0.591 to −0.556) | 0.002 (−0.010 to 0.018) | 0.48 (−3.73 to 4.69) |
| Middle | 0.034 | −0.101*** (−0.118 to −0.084) | −0.004 (−0.006 to −0.001) | −0.97* (−1.61 to −0.33) |
| Rich | 0.074 | 0.367*** (0.349 to 0.384) | 0.029 (0.015 to 0.040) | 7.59*** (4.54 to 10.65) |
| Richest | 0.156 | 0.947*** (0.929 to 0.966) | 0.156 (0.118 to 0.185) | 41.19*** (33.86 to 48.51) |
| Subtotal socioeconomic | 0.183 | 48.29 | ||
| Residual | −0.163 (−0.205 to −0.126) | −43.09*** (−55.62 to −30.56) | ||
| Overall CIX | 0.38*** (0.37 to 0.38) | 100% | ||
***P<0.001; **p<0.01; *p<0.05.
SSA, sub-Saharan Africa.