Gender
1 = male
2 = female

Age
1 = ≤49
2 = 50-64
3 = ≥65

Marital status
1 = Married
2 = Nonmarried

Living situation
1 = Alone
2 = Live with children
3 = Live with spouse
4 = Other

Monthly family income per capita
1 = ≤2000
2 = 2001-4000
3 = ≥4000

Caregiver
0 = Relatives
1 = Nonrelatives

Self-care ability
1 = Full
2 = Partial
3 = None

Years on hemodialysis
1 = <5
2 = 5-10
3 = >10

Hemodialysis frequency
1 = 3 times
2 = <3 times
3 = >3 times

Psychological distress
0 = No
1 = Yes