Table 3.
Decomposition of socioeconomic inequality in dental care utilization among Iranian households, 2017
| Marginal effect | Elasticity | C x | Contribution to the Cn | |||
|---|---|---|---|---|---|---|
| Contribution | % | Summed percentage | ||||
| Demographic variables | ||||||
| Sex of household head | ||||||
| Male | 0.0144** | 0.2655 | 0.0511 | 0.0142 | 5.65 | 5.65 |
| Female (ref.) | ||||||
| Age of household head | ||||||
| 15–45(ref.) | ||||||
| 46–65 | −0.0022 | − 0.0188 | 0.0813 | − 0.0016 | − 0.64 | |
| 66 and above | −0.0175*** | − 0.0748 | − 0.2034 | 0.0160 | 6.32 | 5.69 |
| Socioeconomic variables | ||||||
| Marital status of household head | ||||||
| Single (ref.) | ||||||
| Married | 0.0017 | 0.0312 | 0.0589 | 0.0019 | 0.76 | |
| Divorced/widow | −0.0204* | − 0.0053 | − 0.3004 | 0.0017 | 0.66 | 1.42 |
| Education status of household head | ||||||
| Illiterate (ref.) | ||||||
| Literate | 0.0114*** | 0.1781 | 0.1068 | 0.0200 | 7.91 | 7.91 |
| Wealth index of households | ||||||
| Poorest (ref.) | ||||||
| Poor | 0.0135*** | 0.0577 | −0.4024 | − 0.0243 | −9.65 | |
| Middle | 0.0245*** | 0.1050 | −0.0021 | − 0.0002 | − 0.09 | |
| Rich | 0.0254*** | 0.1091 | 0.3986 | 0.0456 | 18.08 | |
| Richest | 0.0377*** | 0.1619 | 0.7995 | 0.1358 | 53.82 | 62.16 |
| Insurance coverage | ||||||
| Yes | 0.0065** | 0.1243 | 0.0134 | 0.0017 | 0.69 | 0.69 |
| No (ref.) | ||||||
| Ecological variables | ||||||
| Geographical area | ||||||
| Urban | 0.0187*** | 0.1977 | −0.0926 | − 0.0192 | −7.62 | −7.62 |
| Rural (ref.) | ||||||
| Province | ||||||
| Tehran (ref.) | ||||||
| Markazi | −0.0289*** | − 0.0236 | 0.0122 | −0.0003 | − 0.12 | |
| Gilan | −0.0240*** | − 0.0165 | − 0.1053 | 0.0018 | 0.72 | |
| Mazandaran | −0.0256*** | −0.0160 | 0.1759 | −0.0029 | −1.17 | |
| East Azerbaijan | 0.0036 | 0.0026 | 0.0512 | 0.0001 | 0.06 | |
| West Azerbaijan | −0.0433*** | −0.0281 | 0.0578 | −0.0017 | − 0.68 | |
| Kermanshah | −0.0036 | −0.0024 | − 0.2321 | 0.0006 | 0.24 | |
| Khuzestan | −0.0372*** | −0.0286 | − 0.1917 | 0.0057 | 2.28 | |
| Fars | −0.0164*** | −0.0138 | 0.0813 | −0.0012 | − 0.47 | |
| Kerman | −0.0524*** | −0.0342 | − 0.3863 | 0.0139 | 5.50 | |
| Razavi Khorasan | −0.0154*** | −0.0136 | − 0.0319 | 0.0005 | 0.18 | |
| Esfahan | −0.0009 | −0.0007 | 0.2906 | −0.0002 | − 0.08 | |
| Sistan and Baluchestan | −0.0635*** | −0.0498 | − 0.6079 | 0.0318 | 12.59 | |
| Kurdistan | −0.0218*** | −0.0108 | − 0.0637 | 0.0007 | 0.29 | |
| Hamadan | −0.0243*** | −0.0173 | 0.0930 | −0.0017 | − 0.67 | |
| Chahar Mahall and Bakhtiari | −0.0110** | −0.0058 | 0.1911 | −0.0012 | − 0.46 | |
| Lorestan | −0.0221*** | −0.0133 | − 0.1361 | 0.0019 | 0.75 | |
| Ilam | −0.0211*** | −0.0119 | − 0.2096 | 0.0026 | 1.04 | |
| Kohgiluyeh Buyer Ahmad | −0.0083 | −0.0053 | 0.0820 | −0.0005 | − 0.18 | |
| Bushehr | −0.0462*** | −0.0294 | 0.0169 | −0.0005 | − 0.21 | |
| Zanjan | −0.0305*** | −0.0192 | − 0.0391 | 0.0008 | 0.31 | |
| Semnan | −0.0222*** | −0.0121 | 0.1030 | −0.0013 | − 0.52 | |
| Yazd | −0.0325*** | −0.0223 | 0.3508 | −0.0082 | −3.26 | |
| Hormozgan | −0.0273*** | −0.0219 | 0.2039 | −0.0047 | −1.86 | |
| Ardebil | −0.0276*** | −0.0160 | − 0.0177 | 0.0003 | 0.12 | |
| Qom | −0.0117** | −0.0068 | 0.1966 | −0.0014 | − 0.56 | |
| Qazvin | −0.0400*** | −0.0228 | 0.1218 | −0.0029 | −1.15 | |
| Golestan | −0.0418*** | −0.0318 | 0.0057 | −0.0002 | − 0.07 | |
| North Khorasan | −0.0203*** | −0.0160 | − 0.0823 | 0.0014 | 0.55 | |
| South Khorasan | −0.0474*** | −0.0354 | − 0.0166 | 0.0006 | 0.24 | |
| Alborz | −0.0317*** | −0.0185 | 0.2648 | −0.0052 | −2.04 | 11.37 |
| Residual | 0.03 | 12.72 | ||||
| The Cn | 0.25 | 100.0 | ||||
Note: ***Significant 1%; **Significant 5%; * Significant at 10%