research
Health utility bias: A meta-analytic evaluation
- Publication date
- 1 January 2007
- Publisher
- A common assertion is that rating scale (RS) values are lower than both
standard gamble (SG) and time tradeoff (TTO) values. However, differences among these
methods may be due to method specific bias. While SG and TTO suffer systematic bias, RS
responses are known to depend on the range and frequency of other health states being evaluated.
Over many diverse studies this effect is predicted to diminish. Thus, a systematic review and data
synthesis of RS-TTO and RS-SG difference scores may better reveal persistent dissimilarities.
PURPOSE: To establish through systematic review and meta-analysis the net effect of biases that
endure over many studies of utilities.