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Table 3 Multiple linear regression model for FJS-12 and WOMAC-Total

From: Association of psychological status and patient-reported physical outcome measures in joint arthroplasty: a lack of divergent validity

 

FJS-12

   

WOMAC-Total

   

Predictors

Adjusted R 2

Change adjusted R 2

F

p

Adjusted R 2

Change adjusted R 2

F

p

Gender

0.018

0.018

4.75

0.030

0.019

0.019

4.84

0.029

+ Education

0.036

0.018

2.88

0.024

0.043

0.024

2.18

0.014

+ Location

0.063

0.027

3.67

0.003

0.093

0.050

3.24

<0.001

+ BSI-GSI

0.237

0.174

11.34

<0.001

0.353

0.260

8.71

<0.001

+ Catastrophising

0.363

0.126

17.29

<0.001

0.636

0.283

13.00

<0.001

+ BSI-Somatisation

0.379

0.016

16.27

<0.001

0.683

0.047

12.20

<0.001

  1. Equations for the final regression models (unstandardised):
  2. WOMAC Total = −5.176 + 0.986*sex - 1.614*education_d1 - 3.503*education_d2 -3.939*education_d3 + 2.058*location + 0.311*BSI-GSI + 7.984*Catastrophising + 13.292*BSI-Somatisation.
  3. FJS-12 = 84.521 - 2.258*sex + 0.540*education_d1 + 3.125*education_d2 + 13.073*education_d3 - 4.178*location - 7.105*BSI-GSI - 8.675*Catastrophising - 13.102*BSI-Somatisation.
  4. Coding of predictors:
  5. Sex: Male = 0, Female = 1.
  6. Education (dummy-coded):
  7. Apprenticeship: d1 = 1.
  8. A-level/professional school: d2 = 1.
  9. University: d3 = 1.
  10. Else: d1. d2. d3 = 0.
  11. Location: 1 = THA, 2 = TKA.