Table 1 Covariate measurement and attributes
Covariates | Measurements | Meanings |
|---|---|---|
Gender | 1 = male vs. 0 = female | A dichotomous variable |
Age | Range from 60 to 98 | A continuous variable |
Urban or Rural | 1 = urban vs. 0 = rural | A dichotomous variable |
Marital status | 1 = marriage/cohabitation vs. 0 = single/ widowed | A dichotomous variable |
Living condition | 1 = living alone vs. 0 = living with others | A dichotomous variable |
Pensions | 1 = yes vs. 0 = no | A dichotomous variable |
Education background | 1: nursery 2: kindergarten 3: primary school 4: junior high school 5: senior high school 6: college or university | The higher the score, the higher the level of education background |
Physical health | Range from 1 to 5 | The higher the score, the worse the health status of the participants |
Life satisfaction | Range from 1 to 5 | The higher the score, the higher the life satisfaction of the participants |
Intelligence level | Range from 1 to 10 | The higher the score, the higher the intelligence level of the participants marked by interviewers |