Table 5.

Regression models between illness perception items, patient characteristics, social support and dependent variable mental health-related quality of life (SF-36)

	Model 1 (Block 1)		Model 2 (Block 1–2)		Model 3 (Block 1–3)		Model 4 (Block 1–4)
	R2	β	R2	β	R2	β	R2	β
Block 1
Illness perception	0.452		0.447		0.554		0.582
Identity		−0.12		−0.12		−0.02		−0.01
Consequences		−0.22*		− 0.21*		− 0.07		−0.03
Treatment control		−0.02		−0.03		− 0.03		− 0.01
Personal control		0.07		0.09		0.03		0.01
Illness coherence		0.19*		0.19*		0.18*		0.12
Timeline (cyclical)		−0.06		−0.07		0.04		0.03
Emotional representation		−0.34**		−0.31**		−0.26*		−0.27*
Block 2
Demographic characteristics
Age				0.08		0.10		0.08
Monthly net income				0.02		0.03		0.02
Block 3
Clinical characteristics
Additional medication						−0.02		−0.02
Co-morbidity						−0.09		−0.07
Disease activity						0.08		0.13
Pain						−0.12		−0.15
Functional disability						−0.10		−0.11
Fatigue						−0.33**		−0.36**
Block 4
Social support
Positive support								0.19
Detrimental interaction								−0.10
R2 change				0.43		0.55		0.58

*p ≤0.05;** p ≤ 0.01; R² is adjusted R²; β is standardized coefficient β

All variables with a p-value < 0.2 in univariate analysis were included in the regression model