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Table 4 Association between the study participants’ characteristics and the SF-36 health-related quality of life scores 6 months after total knee arthroplasty (n = 138)

From: Determinants of pain, functional limitations and health-related quality of life six months after total knee arthroplasty: results from a prospective cohort study

SF-36 SCORE 6 MONTHS AFTER TKA β 95% CI p value
Physical functioning (R 2= 0.23)    
  SF-36 Physical functioning score before surgery (%) 0.24 0.01 to 0.47 0.036
  Presence of contralateral knee pain before surgery§ - 12.68 - 20.37 to - 4.99 0.001
  Psychological distress (PSI score /42) - 0.54 - 1.06 to - 0.02 0.04
  Comorbidities (CIRS score / 56) - 2.60 −4.11 to - 1.08 <0.001
Role-physical (R 2= 0.17)    
  SF-36 Role-physical score before surgery (%) 0.31 0.12 to 0.51 0.01
  Comorbidities (CIRS score /56) - 2.02 - 3.91 to - 0.13 0.04
  Number of in-hospital complications −7.41 - 14.23 to - 0.69 0.03
Bodily Pain (R 2= 0.13)    
  SF-36 Bodily pain score before surgery (%) 0.72 0.43 to 1.01 <0.001
  Presence of contralateral knee pain before surgery −7.45 −14.34 to - 0.55 0.03
  Comorbidities (CIRS score /56) - 1.97 - 3.37 to - 0.57 0.001
  Number of in-hospital complications −5.47 - 10.52 to - 0.39 0.04
  1. TKA: Total knee arthroplasty.
  2. Stepwise multiple regression analysis.
  3. Multivariate unstandardized linear regression coefficients. For each unit of the participants’ characteristics there is on average a β increase (+) or a decrease (−) on the SF-36 score. A positive β has a positive effect on the participants’ condition and a negative β has a negative effect.
  4. SF-36 scores before surgery, psychological distress and comorbidities treated as continuous variables. Higher scores signify better patient status.
  5. Other independent variables are categorical.
  6. § Presence compared to absence of contralateral knee pain as measured by the WOMAC pain scale.
  7. Reference category = 0 compared to 1 or ≥ 2 complications.