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Table 1 Coding of variables

From: Relationship between chronic diseases and depression: the mediating effect of pain

Variable Coding
Chronic disease No chronic disease = 0, One chronic disease = 1, Two or more chronic diseases = 2
Depression No = 0, Yes = 1
Pain severity No pain = 0, Mild pain = 1, Moderate to severe pain = 2
Take steps to relieve pain No = 0, Yes = 1
Gender Female = 0, Male = 1
Age 45–59 = 1, 60–69 = 2, 70–101 = 3
Education Uneducated = 0, Primary school = 1, Middle school = 2, High school and above = 3
Urbanity Rural = 0, Urban = 1
Marital status Unmarried = 0, Married = 1
Employment status No = 0, Yes = 1
Insurance situation No = 0, Yes = 1