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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