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Table 1 Definitions/codes of variables

From: Gender differences in depressive symptoms of rural Chinese grandparents caring for grandchildren

Variables Definitions/codes
CES-D Continuous variable, 0–30
Square root of CES-D Continuous variable, 0–5.48
Grandchild-care duration Continuous variable, 0–168 h
Grandchild-care provision No = 0, Yes = 1
Grandchild-care intensitya No care = 0, Low intensity = 1, Moderate intensity = 2, High intensity = 3
Grandchild-care intensityb Low intensity = 0, Moderate intensity = 1, High intensity = 2
Age, years 45–59 years = 1, ≥60 years = 2
Gender Male = 0, Female = 1
Education level Illiterate = 1, Primary school or below = 2,
Middle school = 3, High school or above = 4
Marital status Separated/Divorced/Widowed/Never married = 0, Married = 1
Work status Unemployed = 0, Working = 1
Annual household income Poorest = 1, 2nd quintile = 2, Middle = 3, 4th quintile = 4, Richest = 5
Receiving intergenerational support from children No = 0, Yes = 1
Co-habiting with children No = 0, Yes = 1
Number of grandchildren Continuous variable
Engagement in social activities No = 0, Yes = 1
Suffering from chronic disease No = 0, Yes = 1
ADLs score Continuous variable, 0–18
IADLs score Continuous variable, 0–18
  1. ADLs Activities of Daily Living, IADLs Instrumental Activities of Daily Living
  2. aAmong all participates
  3. bAmong the caregivers