| | Variables | Variable name and encoding |
| | Gender | Male = 1 and female = 2 | | Age (years) | Less than 30 = 1, 30 to 45 = 2, 46 to 60 = 3, and more than 60 = 4 | | Education level | Primary or below = 1, junior high school = 2, senior high school = 3, junior college = 4, undergraduate = 5, and master’s degree and above = 6 | | Years of working | Less than 5 years = 1, 5 to 10 years = 2, 11 to 20 years = 3, 21 to 30 years = 4, and more than 30 years = 5 | | Living place | Rural = 1, cities and towns = 2, third-tier city = 3, second-tier city = 4 | | Marital status | Never married = 1, married = 2, and other (e.g., divorced, widower/widow) = 3 | | Number of children | Zero children = 1, one child = 2, two children = 3, and three or more children = 4 | | Average annual household income | Less than 30,000 yuan = 1; 30,000 to 60,000 yuan = 2; 60,000 to 100,000 Yuan = 3; 100,000 to 200,000 yuan = 4; more than 200,000 yuan = 5 | | Self-assessment of health | More serious than sub-health = −2, sub-health = −1, unclear = 0, and health = 1 | | Subhealth duration | Less than 3 months = 1, 3 to 6 months = 2, 6 months to 1 year = 3, less than 2 years = 4, more than 3 years = 5 | | Number of employees in the work unit | Freelance = 1, less than 50 = 2, 50 to 150 = 3, 150 to 500 = 4, more than 500 = 5 | | Subhealth proportion in the work unit | 10% = 1, 30% = 2, 50% = 3, 70% = 4, more than 90% = 5 |
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