The influence of the ratio bias phenomenon on the elicitation of health states utilities

Judgement and Decision Making, vol. 1(2), pp. 118 – 133.

Autores: José-Luis Pinto Prades, Jorge-Eduardo Martínez Pérez, José-María Abellán Perpiñán.

Abstract

This paper tests whether logically equivalent risk formats can lead to different health state utilities elicited by means of the traditional standard gamble (SG) method and a modified version of the method that we call “double lottery.” We compare utilities for health states elicited when probabilities are framed in terms of frequencies with respect to 100 people in the population (i.e., X out of 100 who follow a medical treatment will die) with SG utilities elicited for frequencies with respect to 1,000 people in the population (i.e., Y out of 1,000 who follow a medical treatment will die). We found that people accepted a lower risk of death when success and failure probabilities were framed as frequencies type “Y deaths out of 1,000” rather than as frequencies type “X deaths out of 100” and hence the utilities for health outcomes were higher when the denominator was 1000 than when it was 100. This framing effect, known as Ratio Bias, may have important consequences in resource allocation decisions.

Towards a better QALY model

Health Economics, vol. 15, pp. 665 – 676.

Autores: José-María Abellán-Perpiñán, José-Luis Pinto-Prades, Ildefonso Méndez-Martínez y Xabier Badía-Llach

Summary

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.

Estimación del valor monetario de los años de vida ajustados por calidad: estimaciones preliminares

Revista Ekonomiaz, Nº. 60(1), pp. 192 – 209.

Autores: José Luis Pinto Prades y Jorge E. Martínez Pérez.

El presente trabajo pretende obtener una estimación del valor monetario del año de vida ajustadopor la calidad (AVAC). Para realizar dicha estimación de un modo directo, a través de la disposi-ción a pagar, se puede partir tanto de ganancias pequeñas de salud como de grandes ganancias.Se ha obtenido un intervalo para el valor monetario del AVAC comprendido entre 9.000 y38.000€, si bien resultan necesarias investigaciones adicionales sobre los efectos que para la de-terminación del mismo tienen los estados de salud empleados, su duración y, especialmente, losllamados «efectos de orden», causados por las diferentes secuencias a que dan lugar las combina-ciones de ambos.

Measuring the health of populations: the veil of ignorance approach

Health Economics, vol. 14, pp. 69-82

Autores: Jose-Luis Pinto-Prades y José-María Abellán-Perpiñán.

Summary

We report the results from two surveys designed to explore whether an application of Harsanyi’s principle of choice form behind a veil of ignorance (VEI) can be used in order to measure the health of populations. This approach was tentatively recommended by Murray et al.(Bull. World Health Organ 2000; 78: 981–994; Summary Measures of population health: Concepts, Ethics, Measurement and Applications, WHO, 2002.) as an appropriate way of constructing summary measures of population health (SMPH) for comparative purposes. The operationalization of the VEI approach used in this paper was suggested by Nord (Summary Measures of Population Health: Concepts, Ethics, Measurement and Applications, WHO, 2002.). We test if VEI and person trade-off (PTO) methods generate similar quality-of-life weights. In addition, we compare VEI and PTO weights with individual utilities estimated by means of the conventional standard gamble (SG) and a variation of it we call double gamble. Finally, psychometric properties like feasibility, reliability, and consistency are examined. Our main findings are next: (1) VEI and PTO approaches generate very different weights; (2) it seems that differences between PTO and VEI are not due to the ‘rule of rescue’; (3) the VEI resembled more a DG than a classical SG; (4) PTO, VEI, and DG exhibited good feasibility, reliability and consistency.

A consistency test of the time trade-off

Journal of Health Economics, vol 22, pp. 1037 – 1052.

Autores: Han Bleichrodt, Jose Luis Pinto, José María Abellán-Perpiñán.

Abstract:

This paper tests the internal consistency of time trade-off utilities. We find significant violationsof consistency in the direction predicted by loss aversion. The violations disappear for higher gaugedurations. We show that loss aversion can also explain that for short gauge durations time trade-offutilities exceed standard gamble utilities. Our results suggest that time trade-off measurements thatuse relatively short gauge durations, like the widely used EuroQol algorithm, are affected by lossaversion and lead to utilities that are too high.

A Psychometric Comparison of Different Health Utility Measures in Patients Affected by Parkinson’s Disease

Nursing Economic$, vol. 36(5), pp. 233 – 245.

Abstract

Parkinson’s disease is a chronic disease affecting quality of life and well-being. Cost utility analyses is a method of determining the cost effectiveness of nursing interventions. These analyses are performed using data from preference -based questionnaires. Several options are available but their psychometric properties should be compared to optimize choice. The main purpose of this study was to evaluate the validity, sensitivity, and relative efficiency of 15D and SF-6D questionnaires in Spanish patients with Parkinson’s to be used in cost-effectiveness analyses. Findings indicated SF-6D and 15D are adequate instruments for monitoring of patient’s health during the period of rehabilitation.

Spain. Health system review

Health Systems in Transitions, vol. 20(2).

Autores: Enrique Bernal-Delgado, Sandra García-Armesto, Juan Oliva, Fernando Ignacio Sánchez Martínez, José Ramón Repullo Luz María Peña-Longobardo, Manuel Ridao-López, Cristina Hernández-Quevedo

Abstract

This analysis of the Spanish health system reviews recent developments in organization and governance, health financing, health care provision, health reforms and health system performance. Overall health status continues to improve in Spain, and life expectancy is the highest in the European Union. Inequalities in self-reported health have also declined in the last decade, although long-standing disability and chronic conditions are increasing due to an ageing population. The macroeconomic context in the last decade in the country has been characterized by the global economic recession, which resulted in the implementation of health system-specific measures addressed to maintain the sustainability of the system. New legislation was issued to regulate coverage conditions, the benefits package and the participation of patients in the National Health System funding. Despite the budget constraints linked to the economic downturn, the health system remains almost universal, covering 99.1% of the population. Public expenditure in health prevails, with public sources accounting for over 71.1% of total health financing. General taxes are the main source of public funds, with regions (known as Autonomous Communities) managing most of those public health resources. Private spending, mainly related to out-of-pocket payments, has increased over time, and it is now above the EU average. Health care provision continues to be characterized by the strength of primary care, which is the core element of the health system; however, the increasing financing gap as compared with secondary care may challenge primary care in the long-term. Public health efforts over the last decade have focused on increasing health system coordination and providing guidance on addressing chronic conditions and lifestyle factors such as obesity. The underlying principles and goals of the national health system continue to focus on universality, free access, equity and fairness of financing. The evolution of performance measures over the last decade shows the resilience of the health system in the aftermath of the economic crisis, although some structural reforms may be required to improve chronic care management and the reallocation of resources to high-value interventions.

Converting Parkinson-Specific Scores into Health State Utilities to Assess Cost-Utility Analysis

Patient – Patient Centered Outcomes Research, vol. 11(6), pp. 665 – 675.

Autores: G. Chen, Miguel A. García-Gordillo, Daniel Collado-Mateo, Borja del Pozo-Cruz, José C. Adsuar, José M. Cordero-Ferreira,  José María Abellán-PerpiñánFernando Ignacio Sánchez-Martínez.

Abstract:

Objectives: The aim of this study was to compare the Parkinson’s Disease Questionnaire-8 (PDQ-8) with three multi-attribute utility (MAU) instruments (EQ-5D-3L, EQ-5D-5L, and 15D) and to develop mapping algorithms that could be used to transform PDQ-8 scores into MAU scores. Continue reading «Converting Parkinson-Specific Scores into Health State Utilities to Assess Cost-Utility Analysis»

Reducing preference reversals: the role of preference imprecision and non-transparent methods

Health Economics, vol. 27(8), pp. 1230-1246.

Autores: José Luis Pinto Prades, Fernando I. Sánchez Martínez, José María Abellán Perpiñán y Jorge E. Martínez Pérez.

Abstract

Preferences elicited with matching and choice usually diverge (as characterised by preference reversals), violating a basic rationality requirement, namely,  procedure invariance. Continue reading «Reducing preference reversals: the role of preference imprecision and non-transparent methods»

Improving scope sensitivity in Contingent Valuation: Joint and Separate Evaluation of Health States

Health Economics, vol. 26(12), pp. e304 – e318.

Autores: José Luis Pinto-Prades, José Antonio Robles Zurita, Fernando Ignacio Sánchez-MartínezJosé María Abellán-PerpiñánJorge Martínez-Pérez.

Abstract:

We present data of a contingent valuation survey, testing the effect of evaluation mode on the monetary valuation of preventing road accidents. Half of the interviewees was asked to state their willingness to pay (WTP) to reduce the risk of having only 1 type of injury (separate evaluation, SE), and the other half of the sample was asked to state their WTP for 4 types of injuries evaluated simultaneously (joint evaluation, JE). Continue reading «Improving scope sensitivity in Contingent Valuation: Joint and Separate Evaluation of Health States»