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Table 4 Associations between the study participants' characteristics and the SF-36 health-related quality of life scores (n = 197)

From: Waiting for total knee replacement surgery: factors associated with pain, stiffness, function and quality of life

SF-36 SCORE β 95% CI p value
Physical functioning (r 2 = 0.17)    
   BMI§ - 0.69 - 1.10 – - 0.29 <0.001*
   Use of a walking aid - 8.28 - 13.25 – - 3.31 0.001*
   Contralateral knee pain - 6.03 - 11.37 – - 0.69 0.027*
   Age - 0.26 -0.52 – - 0.01 0.049*
Role-physical (r 2 = 0.17)    
   Use of a walking aid - 15.23 - 22.42 – - 8.06 <0.001*
   Psychological distress - 0.71 - 1.23 – - 0.18 0.008*
   Marital status (Married or common law) 8.47 1.08 – 15.85 0.025*
   Comorbidities -1.46 - 2.95 – - 0.03 0.044*
Bodily pain (r 2 = 0.05)    
   Use of a walking aid - 3.85 - 7.27 – - 0.44 0.027*
Physical component scale - PCS (r 2 = 0.08)°    
   Use of a walking aid - 2.90 - 4.78 – - 1.02 0.003*
   BMI - 0.17 - 0.32 – - 0.02 0.030*
Mental component scale – MCS (r 2 = 0.42)°    
   Psychological distress - 0.74 - 0.88 – - 0.60 <0.001*
   Low social support - 2.28 - 4.14 – - 0.41 0.017*
   Contralateral knee pain - 2.60 - 4.61 – - 0.59 0.011*
  1. Stepwise multiple regression analysis. Age and gender were forced into all models.
  2. 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.
  3. * p < 0.05
  4. § BMI = Body mass index
  5. ° n = 196