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 | Â |
|---|---|---|
MO2 | 1 if mobility is level 2; 0 otherwise | Â |
SC2 | 1 if self-care is level 2; 0 otherwise | Â |
UA2 | 1 if usual activities is level 2; 0 otherwise | Â |
PD2 | 1 if pain/discomfort is level 2; 0 otherwise | Â |
AD2 | 1 if anxiety/depression is level 2; 0 otherwise | Â |
MO3 | 1 if mobility is level 3; 0 otherwise | Â |
SC3 | 1 if self-care is level 3; 0 otherwise | Â |
UA3 | 1 if usual activities is level 3; 0 otherwise | Â |
PD3 | 1 if pain/discomfort is level 3; 0 otherwise | Â |
AD3 | 1 if anxiety/depression is level 3; 0 otherwise | Â |
N3 | 1 if at least one level 3; 0 otherwise | Â |
constant | loss of utility of any health state away from full health | Â |
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 |