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Table 5 Regression models between illness perception items, patient characteristics, social support and dependent variable mental health-related quality of life (SF-36)

From: A cross-sectional study on self-reported physical and mental health-related quality of life in rheumatoid arthritis and the role of illness perception

  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
  1. *p ≤0.05;** p ≤ 0.01; R2 is adjusted R2; β is standardized coefficient β
  2. All variables with a p-value < 0.2 in univariate analysis were included in the regression model