Variable name | Data collection time points | Definitions |
---|---|---|
Demographic characteristics | ||
Age | 2002–2014 | Continuous variable |
Gender | 2002 | Male = 1, female = 0 |
Ethnicity | 2002 | Han = 1, non-Han minorities = 0 |
Socioeconomic Factors | ||
Education | 2002 | No education = 0, received 1–6 years schooling = 1, received 7 years or more education = 2 |
Prof./admin. Occupation | 2002 | Professional work = 1, others = 0 |
Economic independence | 2002 | A dichotomized variable with 1 if the respondent’s primary financial source was from own work or pension, 0 if not |
Childhood SES | 2002 | a continuous variable ranging from 0 to 4 with 1 point each if the respondent was obtained \adequate medical services, or went to bed without hunger, or if both parents were alive at age 10, or the father’s occupation was white collar |
Family Support Factors | ||
Marital status | 2002–2014 | Married = 1, others = 0 |
High proximity to children | 2002–2014 | A dichotomized variable with 1 if the respondent was co-residing with children or had at least 1 biological children living in the same village or street block |
Behavioral Factors | ||
Current smoking | 2002–2014 | Yes = 1, no = 0 |
Exercises regularly | 2002–2014 | Yes = 1, no = 0 |
Consuming vegetables | 2002–2014 | A dichotomized variable with 1 if the respondents said that they consumed vegetables “almost every day”, 0 if answered “occasionally” or “rarely or never.” |
Consuming fish | 2002–2014 | A dichotomized variable with 1 if the respondents said that they consumed fish “almost every day”, 0 if answered “occasionally” or “rarely or never.” |
Health Status | ||
Any chronic condition | 2002–2014 | A dichotomized variable with 1 if the respondents said that they reported hypertension, a pulmonary disorder, heart attack, or cerebrovascular disease. |
Any ADL disability | 2002–2014 | A dichotomized variable with 1 if the respondents said that they needed any help in performing the following tasks: bathing, dressing, toileting, indoor transferring, maintaining continence, and eating. |
Any IADL disability | 2002–2014 | A dichotomized variable with 1 if the respondents said that they needed any help in performing the following tasks: visiting neighbors, washing clothes, walking one kilometer, shopping, cooking, lifting 5 kg, crouching and standing up three times, and using public transportation |
Attrition | 2002–2014 | Survivor = 0, loss to follow-up = 1, deceased = 2 |