Table 4.

Coding independent variables.

Independent Variables	Methods of Coding
Self-assessment of disease severity	* 0-3 = 1, 4-7 = 2, 8-10 = 3
Exercise time per day	* None = 1, Less than 30 min = 2, 30 min to 1 h = 3, More than 1 h = 4
Level of education	* Primary school = 1, Junior high school = 2, High school = 3, College degree or above = 4
Coping modes (Acceptance-resignation scores)	Original numerical value
Social support (PSSS scores)	Original numerical value

* Reference group.