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Table 1 Parameter estimates for the five models which were used to predict the baseline EQ-5D scores.

From: Do estimates of cost-utility based on the EQ-5D differ from those based on the mapping of utility scores?

  Model
  A B C D E
Intercept 0.900‡ 0.886‡ 0.747‡ 0.691‡ -0.347
total WOMAC -0.009‡   0.001   -0.001
pain   -0.012   -0.009  
stiffness   0.006   0.092†  
functioning   -0.009‡   -0.005  
pain* stiffness     -0.005  
pain*functioning     -0.001  
stiffness*functioning     0.001  
pain2     0.002  
stiffness2     -0.011  
functioning2     0.000  
total WOMAC2    -0.000‡   -0.000†
age      0.033*
age2      0.000
sex (if Female)      0.048
Range of predicted scores 0.086 to 0.900 0.086 to 0.900 -0.235 to 0.748 -0.111 to 0.852 -0.184 to 0.828
MAE 0.148 0.147 0.140 0.146 0.129
Adjusted r2 0.275 0.274 0.296 0.299 0.313
RMSE 0.189 0.187 0.185 0.190 0.180
  1. * = p < 0.05, † = p < 0.01, ‡ = p < 0.001, MAE = Mean Absolute Error, RMSE = Root Mean Squared Error. See Appendix 1 for full details of Model C and Model E.