1 Introduction
2 The Income Inequality Hypothesis
3 Data, Measurements and Methods
3.1 Data Collection
3.2 Measurements
3.2.1 Dependent Variable
3.2.2 Independent Variables
3.2.3 Control Variables
3.3 Analytical Strategy
4 Results
OLS and Fixed effects models | Fixed effects model with pseudo panel data | Multilevel | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean | SD | Min | Max | N | Mean | SD | Min | Max | N | Mean | SD | Min | Max | N | |
Self-rated health | 2.764 | .296 | 2.002 | 3.284 | 224 | 2.778 | .412 | 1.230 | 3.654 | 1957 | 3.745 | .943 | 1 | 5 | 287,839 |
Life expectancy at birth | 73.203 | 6.513 | 43.768 | 82.843 | 253 | ||||||||||
Mortality rates | 9.225 | 2.807 | 3.800 | 17.330 | 249 | ||||||||||
Gini | 33.830 | 8.915 | 17.964 | 61.447 | 256 | 34.750 | 9.149 | 17.960 | 61.450 | 1957 | 35.085 | 9.779 | 17.964 | 61.447 | 287,839 |
National social trust | .302 | .158 | .028 | .760 | 256 | .303 | .169 | .000 | .854 | 1957 | .293 | .154 | .028 | .760 | 287,839 |
GDP | 3.131 | 1.681 | −.534 | 7.197 | 256 | 3.162 | 1.716 | −.534 | 7.197 | 1957 | 3.166 | 1.551 | −.534 | 6.755 | 287,839 |
Age average | 43.490 | 5.848 | 28.691 | 84.000 | 256 | 43.118 | 16.405 | 18.000 | 84.000 | 1957 | 42.678 | 4.847 | 28.691 | 84.000 | 287,839 |
Human capital index | 2.745 | .443 | 1.304 | 3.619 | 256 | 2.723 | .465 | 1.304 | 3.619 | 1957 | 2.675 | .456 | 1.304 | 3.519 | 287,839 |
Education | 3.537 | 2.257 | 0 | 7 | 287,839 | ||||||||||
Income | 4.359 | 2.644 | 0 | 9 | 287,839 | ||||||||||
Individual trust | .293 | .455 | 0 | 1 | 287,839 | ||||||||||
Age | 42.827 | 16.834 | 18 | 108 | 287,839 | ||||||||||
Gender | .470 | .499 | 0 | 1 | 287,839 |
4.1 OLS Regression
M1 | M2 | M3 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
NST | SRH | NST | Mortality | NST | Lifeexp | |||||||
Coef. | SE | Coef. | SE | Coef. | SE | Coef. | SE | Coef. | SE | Coef. | SE | |
Intercept | .320** | .116 | 2.766*** | .221 | .363** | .112 | 8.136*** | 2.253 | .361** | .113 | 60.712*** | 3.992 |
Income inequality | −.007*** | .001 | .006* | .003 | −.007*** | .001 | −.064* | .026 | −.007*** | .001 | −.230*** | .045 |
Social trust | .897*** | .129 | −2.985* | 1.274 | 5.254* | 2.216 | ||||||
GDP | .025*** | .006 | .007 | .011 | .025*** | .005 | −.213* | .108 | .025*** | .005 | .834*** | .191 |
Average age | .001 | .002 | −.012** | .004 | .001 | .002 | .078* | .036 | .001 | .002 | .067 | .065 |
Human capital index | .045~
| .026 | .061 | .049 | .041 | .025 | .495 | .497 | .041 | .025 | 4.387*** | .879 |
Indirect | −.006*** | .021*** | −.035** | |||||||||
R2 adjusted | .279 | .253 | .279 | .103 | .265 | .479 |
4.2 Multilevel Model
NST | SRH | |||
---|---|---|---|---|
Coef. | SE | Coef. | SE | |
Intercept | .323*** | .090 | 3.425*** | .241 |
Individual characteristics | ||||
Education | .032*** | .002 | ||
Age | −.013*** | .000 | ||
Male | .082*** | .007 | ||
Income | .033*** | .004 | ||
Trust | .131*** | .006 | ||
Country characteristics | ||||
Income inequality | −.007*** | .001 | .005* | .002 |
Social trust | .649*** | .105 | ||
GDP | .027*** | .005 | .007 | .013 |
Average age | .001 | .001 | −.002 | .005 |
Human capital index | .034 | .023 | .002 | .052 |
Indirect | −.005*** | |||
ICC | .091 | |||
−2 loglikelihood | −343,781.300 |
4.3 Fixed Effects Models
M1 | M2 | M3 | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
NST | SRH | NST | Mortality | NST | Lifeexp | |||||||
Coef. | SE | Coef. | SE | Coef. | SE | Coef. | SE | Coef. | SE | Coef. | SE | |
Intercept | .316* | .155 | 2.639*** | .256 | .304* | .147 | 6.146** | 1.841 | .306* | .146 | 68.701*** | 2.941 |
Income inequality | −.001 | .002 | −.006~
| .003 | −.001 | .002 | .075** | .023 | −.001 | .002 | −.083* | .037 |
Social trust | .261~
| .140 | -3.057** | .975 | 1.887 | 1.546 | ||||||
GDP | −.100** | .034 | −.023 | .057 | −.076* | .031 | −.980* | .385 | −.074* | .030 | 1.602** | .606 |
Average age | .001 | .001 | −.007*** | .002 | .001 | .001 | −.018 | .013 | .001 | .001 | .007 | .021 |
Human capital index | −.063 | .050 | .234** | .083 | −.050 | .048 | −.323 | .597 | −.054 | .048 | 1.795~
| .950 |
Indirect | −.003** | .004** | −.002** | |||||||||
R2 overall | .850 | .883 | .859 | .930 | .859 | .967 | ||||||
R2 within | .028 | .153 | .022 | .129 | .020 | .456 |
4.4 Fixed Effects Models with Pseudo Panel Data
NST | SRH | |||
---|---|---|---|---|
Coef. | SE | Coef. | SE | |
Intercept | .485*** | .081 | 2.837*** | .185 |
Income inequality | −.001 | .001 | −.005** | .002 |
Social trust | .374*** | .052 | ||
GDP | −.117*** | .013 | −.014 | .031 |
Average age | −.002* | .001 | −.015*** | .002 |
Human capital index | −.062** | .021 | .243*** | .047 |
Indirect | −.004** | |||
R2 overall | .824 | .848 |
4.5 Robustness Checks
Method/selection/N | Variable | Self-rated health | Mortality rates | Life expectancy | |||
---|---|---|---|---|---|---|---|
NST | SRH | NST | Mortality | NST | Lifeexp | ||
OLS regression/high income countries/(N = 136/164/164) | Income inequality | − | NS | − | − | − | NS |
Social trust | + | − | + | ||||
OLS regression/non-high income countries/(N = 92/90/94) | Income inequality | − | + | − | NS | − | − |
Social trust | NS | NS | NS | ||||
FE regression/high income countries/(N = 136/164/164) | Income inequality | NS | − | NS | + | NS | − |
Social trust | NS | − | NS | ||||
FE regression/non-high income countries/(N = 92/90/94) | Income inequality | NS | NS | NS | NS | NS | NS |
Social trust | + | NS | NS | ||||
Pseudo panels/high income countries/(N = 1149) | Income inequality | NS | − | ||||
Social trust | + | ||||||
Pseudo panels/non-high income countries/(N = 842) | Income inequality | NS | − | ||||
Social trust | + |