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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.