Table 3.
Definitions of controlled variables and description of the mean
| Variable name | Variable definition | Percentage/ Mean | |
|---|---|---|---|
| Gender | Dummy variable: male = 1, female = 0 | 1 = 60.75%, 0 = 39.25% | |
| Age | Continuous variable: age of the participant | Mean = 66.2507 | |
| Ethnic | Dummy variable: Han ethnicity = 1, ethnic minorities = 0 | 1 = 90.86%, 0 = 9.14% | |
| Type of Household Registration (Hukou) | Rural | Dummy variable: rural hukou = 1, others = 0 | 1 = 60.10% |
| Nonrural hukou | Dummy variable: nonrural hukou = 1, others = 0 | 1 = 38.05% | |
| Rural to resident hukou | Dummy variable: rural to resident hukou = 1, others = 0 | 1 = 1.23% | |
| Nonrural to resident hukou | Dummy variable: nonrural to resident hukou = 1, others = 0 | 1 = 0.62% | |
| Marital Status | Single | Dummy variable: single = 1, others = 0 | 1 = 0.91% |
| Married | Dummy variable: married = 1, others = 0 | 1 = 80.62% | |
| Divorce or widowed | Dummy variable: divorced/widowed = 1, others = 0 | 1 = 18.47% | |
| 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 | 1 = 13.38%, 2 = 38.72%, 3 = 29.86%, 4 = 12.11%, 5 = 3.84%, 6 = 2.07%, 7 = 0.02%。 | |
| Range of Migration | Interprovince | Dummy variable: participant migrated from one province to another = 1, otherwise = 0 | 1 = 42.04% |
| Intercity | Dummy variable: participant migrated from one city to another within the same province = 1, otherwise = 0 | 1 = 31.47% | |
| Intercounty | Dummy variable: participant migrated from one county to another within the same province = 1, otherwise = 0 | 1 = 26.49% | |
| Monthly household income | Continuous variable: monthly household income of the participant (after tax) | Mean = 4975.873 | |
| Main Source of Income | Employment | Dummy variable: participant’s main source of income is his/her own employment = 1, otherwise = 0 | 1 = 30.73% |
| Pension/Savings | Dummy variable: participant’s main source of income is pension or savings = 1, otherwise = 0 | 1 = 42.22% | |
| Other family members | Dummy variable: participant’s main source of income is from other family members = 1, otherwise = 0 | 1 = 22.48% | |
| Others | Dummy variable: participant’s main source of income is from none of the three aforementioned categories = 1, otherwise = 0 | 1 = 4.57% | |
| No. of friends at place of residence | Continuous variable: no. of friends at place of residence | Mean = 8.4683 | |
| Daily exercise time (min) | Continuous variable: average time spent exercising daily, in minutes | Mean = 66.0203 | |
| Physical examination | Dummy variable: participant has had at least one physical examination in the past year = 1, otherwise = 0 | 1 = 35.62%, 0 = 64.38% | |
| Self-rated health | Categorical variable: very unhealthy = 1, unhealthy = 2, basic health values = 3, health values = 4 | 1 = 0.91%, 2 = 8.70%, 3 = 44.45%, 4 = 45.94% | |