Table 3.
Definitions of controlled variables and description of the mean.
| Variable | Definition | Mean | Std. Dev. | |
|---|---|---|---|---|
| Gender | Dummy variable: male = 1, female = 0 | 0.6075 | 0.4884 | |
| Age | Continuous variable: age of the participant | 66.2507 | 5.6929 | |
| Ethnicity | Dummy variable: Han ethnicity = 1, other ethnic minorities = 0 | 0.9086 | 0.2883 | |
| Type of Household Registration (Hukou) | Rural | Dummy variable: rural hukou = 1, others = 0 | 0.6010 | 0.4897 |
| Nonrural | Dummy variable: nonrural hukou = 1, others = 0 | 0.3805 | 0.4856 | |
| Rural to Resident | Dummy variable: rural to resident hukou = 1, others = 0 | 0.0123 | 0.1101 | |
| Nonrural to Resident | Dummy variable: nonrural to resident hukou = 1, others = 0 | 0.0062 | 0.0788 | |
| Marital Status | Single | Dummy variable: single = 1, others = 0 | 0.0091 | 0.0952 |
| Married | Dummy variable: married = 1, others = 0 | 0.8062 | 0.3953 | |
| Divorced/Widowed | Dummy variable: divorced/widowed = 1, others = 0 | 0.1847 | 0.3881 | |
| Education Level | Categorical variable: unschooled = 1, primary school = 2, middle school = 3, high school or technical secondary school = 4, postsecondary college = 5, university = 6, postgraduate = 7 | 2.6062 | 1.1101 | |
| Range of Migration | Interprovince | Dummy variable: participant migrated from one province to another = 1, otherwise = 0 | 0.4204 | 0.4937 |
| Intercity | Dummy variable: participant migrated from one city to another within the same province = 1, otherwise = 0 | 0.3147 | 0.4644 | |
| Intercounty | Dummy variable: participant migrated from one county to another within the same province = 1, otherwise = 0 | 0.2649 | 0.4414 | |
| Monthly Household Income | Continuous variable: monthly household income of the participant (after tax) | 4975.873 | 4596.587 | |
| Main Source of Income | Employment | Dummy variable: participant’s main source of income is his/her own employment = 1, otherwise = 0 | 0.3073 | 0.4614 |
| Pension/Savings | Dummy variable: participant’s main source of income is pension or savings = 1, otherwise = 0 | 0.4222 | 0.4940 | |
| Other Family Members | Dummy variable: participant’s main source of income is from other family members = 1, otherwise = 0 | 0.2248 | 0.4175 | |
| Others | Dummy variable: participant’s main source of income is from none of the three aforementioned categories = 1, otherwise = 0 | 0.0457 | 0.2089 | |
| No. of Friends at Place of Settlement | Continuous variable: no. of friends at place of settlement | 8.4683 | 10.8908 | |
| Daily Exercise Time (min) | Continuous variable: average time spent exercising daily, in minutes | 66.0203 | 45.2182 | |
| Physical Examination | Dummy variable: participant has had at least one physical examination in the past year = 1, otherwise = 0 | 0.3562 | 0.4789 | |