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Mesure et interprétation du changement d'utilité dérivée d'instruments de qualité de vie psychométriques

Abstract : In health economic, the concept of utility was used to describe a state of health in patients. The unit value of health state utility ranges between 0, representing "death" state, and 1 representing a "perfect" health state. It is possible to recover through the measurement of utility both the clinical outcome and their impact on the health of the patient, and thus express the quality of life related to health. In this work, we used the indirect approach for estimating utility that is derived from a generic utility scales (quality of life questionnaires). The objectives of this thesis were to define a threshold of change for the utility derived from psychometric instruments measuring quality of life, and to take into account for the change interpretation, the presence of comorbidities or a response-shift phenomenon. We used data from a cohort of patients with osteoarthritis of lower limbs (KHOALA cohort) for estimate the impact of comorbidities in utility measured by the SF-6D its change over 3 years. We are also interested in the particular case of living kidney donors. The utility was estimated by the EQ-5D and SF-6D before and 3 months after kidney donation. A threshold of significant deterioration has been estimated and the presence of a response-shift phenomenon was controlled. The results showed the deleterious effect of comorbidities on utility measurement for patients with lower limbs osteoarthritis, and highlighted the importance of the functional severity of osteoarthritis in the expression of utility and its change over time. Living kidney donors experienced a significant decrease in their utility score in the short term, and more than third of donors have reached the threshold of significant deterioration. The threshold of utility change varies depending on the population studied, the measurement instrument, and the methodology used to define the threshold. In conclusion, the assessment of utility change must take into account the existence of other diseases and the adaptation of the individual on his health state variation. The complexity of measuring individual preferences by psychometric instruments should lead to be careful about introducing them in the economic evaluation. The use of a threshold for the interpretation of utility change can be an additional element in the decision-making process
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Submitted on : Tuesday, January 14, 2020 - 9:34:46 AM
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Kossar Hosseini. Mesure et interprétation du changement d'utilité dérivée d'instruments de qualité de vie psychométriques. Médecine humaine et pathologie. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0277⟩. ⟨tel-01750622⟩



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