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Table 2 Definition of dummy variables and model specification

From: Similar responses to EQ-5D-3L by two elicitation methods: visual analogue scale and time trade-off

Dummy variables Definition  
MO2 1 if mobility is level 2; 0 otherwise  
SC2 1 if self-care is level 2; 0 otherwise  
UA2 1 if usual activities is level 2; 0 otherwise  
PD2 1 if pain/discomfort is level 2; 0 otherwise  
AD2 1 if anxiety/depression is level 2; 0 otherwise  
MO3 1 if mobility is level 3; 0 otherwise  
SC3 1 if self-care is level 3; 0 otherwise  
UA3 1 if usual activities is level 3; 0 otherwise  
PD3 1 if pain/discomfort is level 3; 0 otherwise  
AD3 1 if anxiety/depression is level 3; 0 otherwise  
N3 1 if at least one level 3; 0 otherwise  
constant loss of utility of any health state away from full health  
Model Specification f(x) Methods
Model 1 f (MO2 MO3 SC2 SC3 UA2 UA3 PD2 PD3 AD2 AD3 N3) VAS model with constant and N3
Model 2 f (MO2 MO3 SC2 SC3 UA2 UA3 PD2 PD3 AD2 AD3 N3) TTO model with constant and N3
Model 3 f (MO2 MO3 SC2 SC3 UA2 UA3 PD2 PD3 AD2 AD3) VAS model without constant and N3
Model 4 f (MO2 MO3 SC2 SC3 UA2 UA3 PD2 PD3 AD2 AD3) TTO model without constant and N3