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Table 4 Regression models between illness perception items, patient characteristics, social support and dependent variable physical 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 0.511   0.536   0.565   .0.565  
  Identity   −0.07   −0.08   −0.05   −0.05
  Consequences   − 0.37**   −0.39**   − 0.34**   −0.34**
  Treatment control   0.04   0.06   0.04   0.04
  Personal control   0.14   0.08   0.03   0.03
  Illness coherence   0.01   −0.04   −0.04   −0.05
  Timeline (cyclical)   −0.39**   −0.36**   −0.30**   −0.30**
  Emotional representation   −0.05   −0.02   − 0.01   - 0.00
Block 2
 Demographic characteristics
  Age     −0.16   − 0.16   − 0.16
  Marital status     −0.06   −0.08   − 0.08
  Educational level     −0.04   − 0.07   −0.07
Block 3
 Clinical characteristics
  Additional medication       0.03   0.03
  Co-morbidity       −0.08   −0.08
  Disease activity       −0.03   −0.03
  Pain       0.01   0.01
  Functional disability       −0.18   −0.18
  Fatigue       −0.02   −0.02
Block 4
 Social support
  Detrimental interaction         0.08
R2 change    0.53    0.56   0.63
  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