Browsing by Subject "Power QALY model"

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    A test of the predictive validity of QALYs using chronic and temporary time trade-off values
    (Elsevier, 2004-02) Abellán Perpiñán, José María; Pinto Prades, José Luis; Méndez Martínez, Ildefonso; Badía Llach, Xabier; Economía Aplicada
    This paper presents a test of the predictive validity of various classes of QALY models (i.e., linear, power and exponential models). We first estimated TTO utilities for 43 EQ-5D chronic health states and next these states were embedded in health profiles. The chronic TTO utilities were then used to predict the responses to TTO questions with health profiles. We find that the power QALY model clearly outperforms linear and exponential QALY models. Optimal power coefficient is 0.65. Our results suggest that TTO-based QALY calculations may be biased. This bias can be avoided using a power QALY model.
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    Towards a better QALY model
    (Wiley, 2006-07-03) Abellán Perpiñán, José María; Pinto Prades, José Luis; Méndez Martínez, Ildefonso; Badía Llach, Xabier; Economía Aplicada
    This paper presents a test of the predictive validity of various classes of QALY models (i.e. linear, power and exponential models). We first estimated TTO utilities for 43 EQ-5D chronic health states and next these states were embedded in nonchronic health profiles. The chronic TTO utilities were then used to predict the responses to TTO questions with nonchronic health profiles. We find that the power QALY model clearly outperforms linear and exponential QALY models. Optimal power coefficient is 0.65. Our results suggest that TTO-based QALY calculations may be biased. This bias can be corrected using a power QALY model.