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Table 2 Parameter estimates for the VAS and TTO models using a linear mixed model in the general population and in health professionals

From: Utility estimation of hypothetical chronic obstructive pulmonary disease health states by the general population and health professionals

Parameter Visual analogue scale Time trade-off
Coefficient (SE) p-value Coefficient (SE) p-value
General population       
Intercept = moderate COPD 0.750 0.009 <0.0001 0.824 0.011 <0.0001
Severe COPD −0.179 0.005 <0.0001 −0.178 0.006 <0.0001
Very severe COPD −0.482 0.005 <0.0001 −0.519 0.006 <0.0001
One non-serious exacerbation −0.078 0.004 <0.0001 −0.082 0.005 <0.0001
One serious exacerbation −0.155 0.005 <0.0001 −0.164 0.006 <0.0001
One non-serious and one serious exacerbation −0.217 0.005 <0.0001 −0.228 0.006 <0.0001
Generalized R2 0.83    0.86   
MAE, mean (SD) 0.008 (0.006)   0.008 (0.007)  
Health professionals       
Intercept = moderate COPD 0.759 0.027 <0.0001 0.883 0.025 <0.0001
Severe COPD −0.226 0.014 <0.0001 −0.234 0.016 <0.0001
Very Severe COPD −0.496 0.014 <0.0001 −0.590 0.016 <0.0001
One non-serious exacerbation −0.072 0.012 <0.0001 −0.070 0.014 <0.0001
One serious exacerbation −0.147 0.014 <0.0001 −0.148 0.017 <0.0001
One non-serious and one serious exacerbation −0.196 0.014 <0.0001 −0.207 0.017 <0.0001
Generalized R2 0.93    0.88   
MAE, mean (SD) 0.004 (0.003)   0.011 (0.008)