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Table 3 Coefficients of the predictive equations of utilities (EQ-5D) based on the Oxford Knee Score (OKS) items. Estimation sample

From: Mapping analysis to predict EQ-5D-5 L utility values based on the Oxford Hip Score (OHS) and Oxford Knee Score (OKS) questionnaires in the Spanish population suffering from lower limb osteoarthritis

  OLS Tobit GLM Beta regression
Knee OA
 OKS1: Usual level of pain 0.0471§ (0.0122) 0.0434§ (0.0129) −0.155§ (0.0384) 0.2227Ŧ (0.0699)
 OKS2: Difficulty with washing and drying 0.0532§ (0.0122) 0.0525§ (0.0121) −0.106§ (0.0271) 0.2296§ (0.0521)
 OKS3: Difficulty with cars/public transport     0.1592* (0.0666)
 OKS4: Walking duration before pain     0.0794* (0.0353)
 OKS9: Pain that interferes with work 0.0574§ (0.0119) 0.0515§ (0.0121) −0.120§ (0.0317) 0.2688§ (0.0477)
 OKS10: Knee instability sensation 0.0289Ŧ (0.0102) 0.0263Ŧ (0.0100) −0.0491* (0.0207) 0.1431§ (0.0340)
 OKS11: Grocery shopping alone 0.0432§ (0.0104) 0.0385§ (0.0104) −0.0710Ŧ (0.0235)  
 OKS12: Difficulty walking down stairs   0.0276* (0.0118) −0.0881Ŧ (0.0280)  
 Constant 0.122§ (0.0270) 0.1034§ (0.0273) 0.124* (0.0536) −1.4199§ (0.2001)
 Observations 390 390 390 386
 Adjusted R2 0.595 0.606   
 Sigma   0.171 (0.007)   
 AIC − 257.1 −211.3 −289.1 − 457.2
 BIC −233.3 −243.1 −261.3 − 425.6
  1. ¶ Questions 5, 6, 7 and 8 of the OKS did not fit any model
  2. OLS Ordinary least squares
  3. GLM Generalized linear model. Link function: log. Distributional family: Gaussian
  4. Standard errors in parentheses
  5. * p < 0.05
  6. Ŧ p < 0.01
  7. § p < 0.001