Table 1.
Recode rules regarding independent variables.
| Variables | Definition | Assignment |
|---|---|---|
| Region | Multiple classes of dummy variables: Jiangsu Province, Zhejiang Province, etc. | Four classes of dummy variables*: 0 = West: Xinjiang Uygur Autonomous Region, Tibet Autonomous Region, Ningxia Hui Autonomous Region, Inner Mongolia Autonomous Region, Gansu Province, Qinghai Province, Shaanxi Province, Yunnan Province, Sichuan Province, Guizhou Province, Chongqing Municipality, Guangxi Zhuang Autonomous Region, 1 = Middle: Shanxi Province, Henan Province, Anhui Province, Hubei Province, Hunan Province, Jiangxi Province 2 = East: Beijing, Tianjin, Shanghai, Hebei Province, Shandong Province, Zhejiang Province, Jiangsu Province, Guangdong Province, Hainan Province 3 = Northeast: Heilongjiang Province, Jilin Province, Liaoning Province |
| Urban/rural | Two classes of dummy variables: Urban/Rural | Two classes of dummy variables: Urban/Rural; 0 = Urban, 1= Rural |
| Gender | Two classes of dummy variables: Male/Female | Two classes of dummy variables: Male/Female; 0 = Male, 1= Female |
| Age | Continuous variables range over 45 years old | Three classes of dummy variables: 0 = Middle-aged individuals range from 45 to 59 1 = Early elderly individuals range from 60 to 74 2 = Late elderly individuals range over 75 |
| Marital status | Five classes of dummy variables: Unmarried, Married, Cohabiting, Divorced, Widowed | Two classes of dummy variables: 0 = With spouse at present: Married, Cohabiting 1 = No spouse at present: Unmarried, Divorced, Widowed |
| Work status | Two classes of dummy variables: In working condition, Not in working state (retired) | Two classes of dummy variables: 0 = In working condition, 1 = Not in working state (retired) |
| Education level | Eight classes of dummy variables: Illiterate, Kindergarten, Elementary school, Junior high school, High school, College, Bachelor's degree, Master's degree, Doctorate | Three class of dummy variables: 0 = Primary Education: Illiterate, Kindergarten, Elementary school, 1 = Secondary Education: Junior high school, High school, 2 = Higher Education: College, Bachelor's degree, Master's degree, Doctorate |
| Self-assessed income level | Five classes of dummy variables: High-income, Upper-Middle-income, Middle-income, Lower-Middle-income, Low-income | Five classes dummy variables: 0 = High-income, 1 = Upper-Middle-income, 2 = Middle-income, 3 = Lower-Middle-income, 4 = Low-income |
| Chronic diseases | Two classes of dummy variables: with chronic diseases/without chronic diseases | Two classes dummy variables: 0 = With chronic diseases, 1 = Without chronic diseases |
| Self-assessed health status | Five classes of dummy variables: Excellent; Very good; Good; Fair; Poor | Five classes dummy variables: 0 = Excellent; 1 = Very good; 2 = Good; 3 = Fair; 4 = Poor |
*
Provinces are located in regions in accordance with the divisions published by the National Bureau of Statistics of the People's Republic of China.