| Variable type | Variable name | Variable definition | Samplesize | Average value | Standard deviation | |
| Interpreted variables | Subjective well-being | Very unhappy = 1, Not very happy = 2, commonly = 3, More happier = 4, Very happy = 5 | 6017 | 3.743 | 0.794 | |
| Main explain variable | City size | End-of-term population of employees in cities and municipal districts in 2013 (unit: millions) | 6017 | 2.225 | 3.010 | |
| Square of city scale | Quadratic end-of-term number of employees in cities and municipal districts in 2013 | 6017 | 14.011 | 25.652 | ||
| Environmental pollution | Compound value of entropy method | 6017 | 0.0134 | 0.0144 | ||
| Interaction between urban scale and environmental pollution | Multiplication of end-of-term number of employees and environmental pollution in municipal districts | 6017 | 0.0553 | 0.135 | ||
| Control variable | Macroeconomic variables | Average wages of employees | Average annual wages of on-the-job workers in cities and municipal districts in 2013 (unit: 10,000 yuan) | 6017 | 5.597 | 1.725 |
| Gross regional product | Regional gross domestic product of cities and municipalities in 2013 (unit: 10 billion yuan) | 6017 | 52.747 | 62.691 | ||
| Personal characteristic variables | Gender | Female = 0, Male = 1 | 6017 | 0.485 | 0.500 | |
| Age | Age | 6017 | 49.088 | 13.408 | ||
| Age squared | Age quadratic | 6017 | 2589.42 | 1387.52 | ||
| Educational level | Have never been to School = 1, Primary school = 2, Junior middle school = 3, High school = 4, Specialty = 5 Undergraduate college = 6, Graduate student = 7 | 6017 | 3.970 | 1.281 | ||
| Health condition | Very bad = 1, Not good = 2, Commonly = 3, Good = 4, Very good = 5 | 6017 | 3.886 | 0.856 | ||
| Are you married? | Unmarried = 0, married = 1 | 6017 | 0.885 | 0.319 | ||
| Are they Party members? | Is it a member of the Communist Party of China? | 6017 | 0.230 | 0.421 | ||
| Relative income | Much higher = 1, Slightly Higher = 2, Fair = 3, Slightly lower = 4, Much lower = 5, Unclear = 6 | 6017 | 3.327 | 1.001 | ||
| Total disposable household income | Total disposable income of households in 2013 (unit: 10,000 yuan) | 6017 | 0.775 | 0.631 | ||
| Interpersonal trust | Very credible = 1, Not very credible = 2, Generally = 3, More credible = 4, Very credible = 5, Not clear = 6 | 6017 | 3.235 | 1.082 | ||