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Lipman SA. Expect Nothing: The (Lack of) Influence of Subjective Life Expectancy on Valuation of Child Health States. FRONTIERS IN HEALTH SERVICES 2022; 2:803109. [PMID: 36925864 PMCID: PMC10012738 DOI: 10.3389/frhs.2022.803109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 03/07/2022] [Indexed: 11/13/2022]
Abstract
Objective Earlier research has shown that individuals' subjective life expectancy (SLE) affects health state valuation with time trade-off (TTO). Individuals with longer expected life durations are less willing to trade-off life duration, which yields higher utilities. In this article, the influence of SLE is explored in the valuation of EQ-5D-Y-3L with a proxy perspective, i.e., adults' valuation of health states considering the life of a 10-year-old child. As SLE for children is likely higher, this might explain earlier findings suggesting that individuals are less willing to trade-off years of life for children than for adults. Methods A total of 197 respondents were recruited to take part in digital TTO interviews, facilitated by trained interviewers. TTO interviews were implemented in accordance with the recommended protocol for the valuation of EQ-5D-Y-3L. Respondents valued 10 EQ-5D-Y-3L health states for a 10-year-old child, after which they were asked to report how old they themselves expected to become and also how old they expected a 10-year-old child to become. Results Generally, adult respondents reported higher SLE for children than for themselves. Neither SLE was systematically associated with the willingness to trade lifetime or the number of life years traded off in TTO tasks. This null-result was substantiated by regression analyses per health state. Conclusion The results of this study suggest that individuals' expectations about longevity are not associated with EQ-5D-Y-3L valuation. This lack of association is in contrast to earlier work and might be explained by the psychological distance introduced with proxy perspective valuation, or by the methodological differences with earlier work.
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Affiliation(s)
- Stefan A Lipman
- Department of Health Economics, Erasmus School of Health Policy & Management, Erasmus University Rotterdam, Rotterdam, Netherlands
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Henstock L, Wong R, Tsuchiya A, Spencer A. Behavioral Theories That Have Influenced the Way Health State Preferences Are Elicited and Interpreted: A Bibliometric Mapping Analysis of the Time Trade-Off Method With VOSviewer Visualization. FRONTIERS IN HEALTH SERVICES 2022; 2:848087. [PMID: 36925791 PMCID: PMC10012726 DOI: 10.3389/frhs.2022.848087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Accepted: 05/31/2022] [Indexed: 11/13/2022]
Abstract
Aim The aim of this paper is to develop an understanding of how behavioral theories have influenced the way preferences for health-related quality of life are elicited and interpreted. We focus on the Time Trade-off (TTO) method given it represents the quality-adjusted life-year (QALY) concept-that survival in less-than-full health can be deemed equivalent to a shorter survival in full health. To our knowledge this is the first review using a combination of systematic scoping review, bibliometrics and VOSviewer visualization to map the development of ideas in health economics. Methods A priori, we selected three behavioral theories to explore within our review, referred to here as Expected Utility Theory, Non-Expected Utility Theory and Probabilistic Choice Theory. A fourth topic, Order Effects, is defined broadly to encompass behavioral theories around timing/sequence of events. For the main search, Scopus was used to identify literature that had (a) elicited TTO values and/or (b) contributed to the way TTO values were elicited and interpreted, from inception to July 2021. Papers that focused on the latter category were given the label "behavioral" and underwent additional analyses. A two stage-screening was applied to assess eligibility. Co-citation, co-authorship and co-occurrence of keywords was used to chart the development of TTO over time. Results A total of 1,727 records were retrieved from Scopus and were supplemented by an additional 188 papers. There were 856 applied and 280 behavioral papers included in the final corpus, with the behavioral set split equally into four sets of 70 papers to chart the development of keywords over time: (1) 1972-1999; (2) 2000-2010, (3) 2010-2015 and (4) 2015-2021. Discussion The keyword analysis suggested that whilst some ideas transition quickly from economic theory to the TTO literature, such as the impact of Order Effects, others take longer to be assimilated, for example Non-Expected Utility models or failure of constant discounting. It is therefore important that researchers within health economics work more closely with those in mainstream economics and keep abreast of the wider economics and behavioral sciences to expedite the uptake of new and relevant ideas.
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Affiliation(s)
- Luke Henstock
- University of Birmingham, Birmingham, United Kingdom
| | - Ruth Wong
- School of Health and Related Research, University of Sheffield, Sheffield, United Kingdom
| | - Aki Tsuchiya
- Department of Economics and School of Health and Related Research, University of Sheffield, Sheffield, United Kingdom
| | - Anne Spencer
- Department of Health and Community Sciences, University of Exeter, Exeter, United Kingdom
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Lugnér AK, Krabbe PFM. An overview of the time trade-off method: concept, foundation, and the evaluation of distorting factors in putting a value on health. Expert Rev Pharmacoecon Outcomes Res 2020; 20:331-342. [PMID: 32552002 DOI: 10.1080/14737167.2020.1779062] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
INTRODUCTION Preference-based instruments measuring health status express the value of specific health states in a single number. One method used is time trade-off (TTO). Health-status values are key elements in calculating quality-adjusted life years (QALYs) and are pertinent for resource allocation. Since they are used in economic evaluations of healthcare, searching for a theoretical foundation of TTO in economics is justified. AREA COVERED This paper provides an overview of TTO, including its relation to economic theory, and discusses biases and distortions, compiled from recent and older research. Inconsistencies between TTO and random utility theory were detected; The TTO is confounded by time preferences and by respondents' life expectancies. TTO is cognitively challenging, therefore guidance during the interviews is needed, producing interview effects. TTO does not measure one thing at a time, nor are the values independent of other states that are being valued in the same task. That is, TTO does not exhibit theoretical measurement properties such as unidimensionality and the invariance principle. EXPERT OPINION We conclude that the TTO may be a pragmatic method of eliciting health state values, but the limitations in regard to measurement theory and practical elicitation problems makes it prone to inconsistencies and arbitrariness.
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Affiliation(s)
| | - Paul F M Krabbe
- Department of Epidemiology, University of Groningen, University Medical Center Groningen , Groningen, The Netherlands
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Lipman SA, Brouwer WBF, Attema AE. Living up to expectations: Experimental tests of subjective life expectancy as reference point in time trade-off and standard gamble. JOURNAL OF HEALTH ECONOMICS 2020; 71:102318. [PMID: 32229049 DOI: 10.1016/j.jhealeco.2020.102318] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 03/13/2020] [Accepted: 03/14/2020] [Indexed: 05/05/2023]
Abstract
Earlier work suggested that subjective life expectancy (SLE) functions as reference point in time trade-off (TTO), but has not tested or modelled this explicitly. In this paper we construct a model based on prospect theory to investigate these predictions more thoroughly. We report the first experimental test of reference-dependence with respect to SLE for TTO and extend this approach to standard gamble (SG). In two experiments, subjects' SLEs were used to construct different versions of 10-year TTO and SG tasks, with the gauge duration either described as occurring above or below life expectation. Our analyses suggest that both TTO and SG weights were affected by SLE as predicted by prospect theory with SLE as reference point. Subjects gave up fewer years in TTO and were less risk-tolerant in SG below SLE, implying that weights derived from these health state valuation methods for durations below SLE will be biased upwards.
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Affiliation(s)
- Stefan A Lipman
- Erasmus School of Health Policy & Management, Erasmus University Rotterdam, the Netherlands.
| | - Werner B F Brouwer
- Erasmus School of Health Policy & Management, Erasmus University Rotterdam, the Netherlands; Erasmus School of Economics, Erasmus University Rotterdam, Rotterdam, the Netherlands
| | - Arthur E Attema
- Erasmus School of Health Policy & Management, Erasmus University Rotterdam, the Netherlands
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Niemeyer KM, Gonzales JA, Doan T, Browne EN, Rao MM, Acharya NR. Time Trade-off Utility Values in Noninfectious Uveitis. Am J Ophthalmol 2019; 208:47-55. [PMID: 31201795 DOI: 10.1016/j.ajo.2019.06.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 06/04/2019] [Accepted: 06/05/2019] [Indexed: 01/19/2023]
Abstract
PURPOSE To investigate time trade-off (TTO) utility values in patients with noninfectious uveitis and determine whether patient demographics and clinical characteristics are associated with utility scores. DESIGN Time trade-off utility analysis. METHODS Setting: A tertiary care uveitis center in San Francisco, California, USA. PATIENT POPULATION One hundred and four consecutive adults with noninfectious uveitis, enrolled between November 2016 and February 2017. MAIN OUTCOME MEASURES TTO utility values, as collected by an interviewer-guided survey. Information regarding general health, ocular symptoms, and religion was also collected and medical record review was conducted to record anatomic location of uveitis, disease activity, visual acuity, and treatments. Multivariable regression analysis with backward selection was used to identify variables associated with TTO values. RESULTS Median TTO score was 0.975 (interquartile range [IQR]: 0.8-1.0), corresponding to trading a median 1.28 years of remaining life for healthy eyes (IQR: 0-6.29). Regression analysis revealed that worse eye visual acuity, >6 months of oral corticosteroid use, and current antidepressant use were associated with lower TTO scores (P = .008, P = .006, P = .008, respectively), controlling for age and sex. In particular, patients who had been taking oral corticosteroids for more than 6 months, regardless of dose, were 10.5 times more likely to trade 20% or more years of remaining life (TTO ≤0.8) than patients not taking oral corticosteroids (95% confidence interval: 2.3, 48.1; P = .002). CONCLUSIONS Patients with noninfectious uveitis had measurable, though modest, reductions in quality of life, as assessed by TTO, and these decreases were significantly associated with visual acuity in the worse eye and long-term oral corticosteroid use.
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Affiliation(s)
- Katherine M Niemeyer
- F.I. Proctor Foundation, University of California, San Francisco, San Francisco, California, USA
| | - John A Gonzales
- F.I. Proctor Foundation, University of California, San Francisco, San Francisco, California, USA; Department of Ophthalmology, University of California, San Francisco, San Francisco, California, USA
| | - Thuy Doan
- F.I. Proctor Foundation, University of California, San Francisco, San Francisco, California, USA; Department of Ophthalmology, University of California, San Francisco, San Francisco, California, USA
| | - Erica N Browne
- F.I. Proctor Foundation, University of California, San Francisco, San Francisco, California, USA
| | - Maya M Rao
- F.I. Proctor Foundation, University of California, San Francisco, San Francisco, California, USA
| | - Nisha R Acharya
- F.I. Proctor Foundation, University of California, San Francisco, San Francisco, California, USA; Department of Ophthalmology, University of California, San Francisco, San Francisco, California, USA; Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California, USA.
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Pahuta M, Frombach A, Hashem E, Spence S, Sun C, Wai EK, Werier J, van Walraven C, Coyle D. The Psychometric Properties of a Self-Administered, Open-Source Module for Valuing Metastatic Epidural Spinal Cord Compression Utilities. PHARMACOECONOMICS - OPEN 2019; 3:197-204. [PMID: 30178420 PMCID: PMC6533369 DOI: 10.1007/s41669-018-0092-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
INTRODUCTION Web surveys are often used for utility valuation. Typically, custom utility valuation tools that have not undergone psychometric evaluation are used. OBJECTIVES This study aimed to determine the psychometric properties of a metastatic epidural spinal cord compression (MESCC) module run on a customizable open-source, internet-based, self-directed utility valuation platform (Self-directed Online Assessment of Preferences [SOAP]). METHODS Individuals accompanying patients to the emergency department waiting room in Ottawa, Canada, were recruited. Participants made SOAP MESCC health state valuations in the waiting room and 48 h later at home. Validity, agreement reliability, and responsiveness were measured by logical consistency of responses, smallest detectable change, the interclass correlation coefficient, and Guyatt's responsiveness index, respectively. RESULTS Of 285 participants who completed utility valuations, only 113 (39.6%) completed the re-test. Of these 113 participants, 92 (81.4%) provided valid responses on the first test and 75 (66.4%) provided valid responses on the test and re-test. Agreement for all groups of health states was adequate, since their smallest detectable change was less than the minimal clinically important difference. The mean interclass correlation coefficients for all health states were > 0.8, indicating at least substantial reliability. Guyatt's responsiveness indices all exceeded 0.80, indicating a high level of responsiveness. CONCLUSIONS To our knowledge, this is the first validated open-source, web-based, self-directed utility valuation module. We have demonstrated the SOAP MESCC module is valid, reproducible, and responsive for obtaining ex ante utilities. Considering the successful psychometric validation of the SOAP MESCC module, other investigators can consider developing modules for other diseases where direct utility valuation is needed.
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Affiliation(s)
- Markian Pahuta
- Department of Orthopaedic Surgery, Henry Ford Health System, 2799 West Grand Blvd, CFP-6, Detroit, MI USA
| | | | | | | | | | - Eugene K. Wai
- Division of Orthopaedic Surgery, The Ottawa Hospital, Ottawa, ON Canada
| | - Joel Werier
- Division of Orthopaedic Surgery, The Ottawa Hospital, Ottawa, ON Canada
| | - Carl van Walraven
- Department of Epidemiology and Community Medicine, Institute for Clinical Evaluative Sciences, Ottawa Hospital Research Institute, University of Ottawa, Ottawa, ON Canada
| | - Doug Coyle
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON Canada
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Matza LS, Boye KS, Feeny DH, Bowman L, Johnston JA, Stewart KD, McDaniel K, Jordan J. The time horizon matters: results of an exploratory study varying the timeframe in time trade-off and standard gamble utility elicitation. THE EUROPEAN JOURNAL OF HEALTH ECONOMICS : HEPAC : HEALTH ECONOMICS IN PREVENTION AND CARE 2016; 17:979-990. [PMID: 26611792 PMCID: PMC5047932 DOI: 10.1007/s10198-015-0740-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 10/05/2015] [Indexed: 05/04/2023]
Abstract
INTRODUCTION The purpose of this study was to examine whether the time horizon of time trade-off (TTO) and standard gamble (SG) utility assessment influences utility scores and discrimination between health states. METHODS In two phases, UK general population participants rated three osteoarthritis health states in TTO and SG procedures with two time horizons: (1) 10-year and (2) a time horizon derived from self-reported additional life expectancy (ALE). The two time horizons were compared in terms of mean utilities and discrimination among health states. RESULTS In Phase 1, the 10-year tasks were completed by 80 participants, 35 of whom also completed utility assessment with the ALE. In Phase 2, all 101 participants completed procedures with both time horizons. Utility scores tended to be lower with the ALE than the 10-year, a difference that was statistically significant for two health states with SG in Phase 1 (P < 0.05), two health states with TTO in Phase 2 (P < 0.01), and one health state with SG in Phase 2 (P < 0.001). In Phase 1, rates of discrimination between mild and moderate osteoarthritis health states were significantly higher with the ALE than the 10-year (TTO: P = 0.03; SG: P = 0.001). This pattern of discrimination was similar in Phase 2. DISCUSSION Results suggest that the time horizon could influence utility scores and discrimination among health states. When designing utility evaluations, researchers should carefully consider the time horizon so that the value of health states is accurately represented in cost-utility models.
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Affiliation(s)
- Louis S Matza
- Outcomes Research, Evidera, 7101 Wisconsin Avenue, Suite 1400, Bethesda, MD, 20814, USA.
| | | | - David H Feeny
- Department of Economics, McMaster University, Hamilton, ON, Canada
| | - Lee Bowman
- Eli Lilly and Company, Indianapolis, IN, USA
| | | | - Katie D Stewart
- Outcomes Research, Evidera, 7101 Wisconsin Avenue, Suite 1400, Bethesda, MD, 20814, USA
| | - Kelly McDaniel
- Outcomes Research, Evidera, 7101 Wisconsin Avenue, Suite 1400, Bethesda, MD, 20814, USA
| | - Jessica Jordan
- Outcomes Research, Evidera, 7101 Wisconsin Avenue, Suite 1400, Bethesda, MD, 20814, USA
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van Nooten FE, van Exel NJA, Eriksson D, Brouwer WBF. "Back to the future": Influence of beliefs regarding the future on TTO answers. Health Qual Life Outcomes 2016; 14:4. [PMID: 26753687 PMCID: PMC4709901 DOI: 10.1186/s12955-015-0402-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 12/23/2015] [Indexed: 11/25/2022] Open
Abstract
Background A common approach to obtain health state valuations is the time-tradeoff (TTO) method. Much remains unknown regarding the influence of responder characteristics on TTO answers. The objective of this study is to increase understanding of the influence that beliefs regarding future health and death, as well as desires to witness certain life events, have on respondents’ health state valuations. Methods An online survey was designed, including three TTO questions using a 10 year timeframe. Moreover, respondents completed demographic questions, the Health-Risk Attitude Scale (HRAS), the Expectations Regarding Aging (ERA) questionnaire, questions about beliefs regarding future health (i.e. life expectancy) and death (i.e. fear of death, belief in life after death and opinion about euthanasia), and about important life events taking place within the TTO timeframe. Regression analyses were performed in order to assess the influence of these different variables. Results One thousand sixty-seven respondents were included in the analyses. The following variables were significantly associated with years traded off: ERA mental health (decrease), ERA physical health (increase), HRAS (increase), support for euthanasia (increase), fear of death (decrease) and consideration of an important life event (decrease). The explained variance of the final model was low (0.08). Conclusion TTO responses may be influenced by considerations of future health, including life events and attitudes regarding health risks and death. Further investigation of TTO responses remains warranted. Electronic supplementary material The online version of this article (doi:10.1186/s12955-015-0402-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- F E van Nooten
- Institute of Health Policy & Management, Erasmus University Rotterdam, Rotterdam, The Netherlands.
| | - N J A van Exel
- Institute of Health Policy & Management, Erasmus University Rotterdam, Rotterdam, The Netherlands.
| | | | - W B F Brouwer
- Institute of Health Policy & Management, Erasmus University Rotterdam, Rotterdam, The Netherlands. .,Institute for Medical Technology Assessment, Erasmus University Rotterdam, Rotterdam, The Netherlands.
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Matza LS, Sapra SJ, Dillon JF, Kalsekar A, Davies EW, Devine MK, Jordan JB, Landrian AS, Feeny DH. Health state utilities associated with attributes of treatments for hepatitis C. THE EUROPEAN JOURNAL OF HEALTH ECONOMICS : HEPAC : HEALTH ECONOMICS IN PREVENTION AND CARE 2015; 16:1005-18. [PMID: 25481796 PMCID: PMC4646927 DOI: 10.1007/s10198-014-0649-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Accepted: 10/23/2014] [Indexed: 05/09/2023]
Abstract
BACKGROUND Cost-utility analyses are frequently conducted to compare treatments for hepatitis C, which are often associated with complex regimens and serious adverse events. Thus, the purpose of this study was to estimate the utility associated with treatment administration and adverse events of hepatitis C treatments. DESIGN Health states were drafted based on literature review and clinician interviews. General population participants in the UK valued the health states in time trade-off (TTO) interviews with 10- and 1-year time horizons. The 14 health states described hepatitis C with variations in treatment regimen and adverse events. RESULTS A total of 182 participants completed interviews (50% female; mean age = 39.3 years). Utilities for health states describing treatment regimens without injections ranged from 0.80 (1 tablet) to 0.79 (7 tablets). Utilities for health states describing oral plus injectable regimens were 0.77 (7 tablets), 0.75 (12 tablets), and 0.71 (18 tablets). Addition of a weekly injection had a disutility of -0.02. A requirement to take medication with fatty food had a disutility of -0.04. Adverse events were associated with substantial disutilities: mild anemia, -0.12; severe anemia, -0.32; flu-like symptoms, -0.21; mild rash, -0.13; severe rash, -0.48; depression, -0.47. One-year TTO scores were similar to these 10-year values. CONCLUSIONS Adverse events and greater treatment regimen complexity were associated with lower utility scores, suggesting a perceived decrease in quality of life beyond the impact of hepatitis C. The resulting utilities may be used in models estimating and comparing the value of treatments for hepatitis C.
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Affiliation(s)
- Louis S Matza
- Outcomes Research, Evidera, 7101 Wisconsin Avenue, Suite 1400, Bethesda, MD, 20814, USA.
| | - Sandhya J Sapra
- Global Health Economics and Outcomes Research, Bristol-Myers Squibb, Princeton, NJ, USA
| | - John F Dillon
- NHS Tayside and Medical Research Institute, University of Dundee, Dundee, UK
| | - Anupama Kalsekar
- Global Health Economics and Outcomes Research, Bristol-Myers Squibb, Princeton, NJ, USA
| | | | - Mary K Devine
- Outcomes Research, Evidera, 7101 Wisconsin Avenue, Suite 1400, Bethesda, MD, 20814, USA
| | - Jessica B Jordan
- Outcomes Research, Evidera, 7101 Wisconsin Avenue, Suite 1400, Bethesda, MD, 20814, USA
| | - Amanda S Landrian
- Outcomes Research, Evidera, 7101 Wisconsin Avenue, Suite 1400, Bethesda, MD, 20814, USA
| | - David H Feeny
- Department of Economics, McMaster University, Hamilton, ON, Canada
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van Nooten FE, van Exel NJA, Koolman X, Brouwer WBF. "Married with children" the influence of significant others in TTO exercises. Health Qual Life Outcomes 2015; 13:94. [PMID: 26135391 PMCID: PMC4487600 DOI: 10.1186/s12955-015-0276-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 05/28/2015] [Indexed: 11/10/2022] Open
Abstract
Background Which responder characteristics influence TTO scores remains underexplored. More research is needed in order to understand (differences in) TTO scores, but also in the context of generating representative health state valuations for some population. Previous studies have found age, gender, marital status and subjective life expectancy to influence the number of years traded off. Objective This study aimed to investigate which other responder characteristics influence TTO responses, with an emphasis on consideration of significant others, such as partners and children. Methods and Design We performed a web-based survey in a representative sample of the Dutch general public (aged 18–65). Data on demographics, health status and expectations about future length and quality of life were gathered. Respondents valued three distinct health states using TTO. Results A total of 1067 respondents completed the questionnaire. Sixty percent of respondents had children and 49 % were married. The mean number of years traded off increased with severity of health states. Higher age and living together were positively associated with number of years traded off. Increases in subjective life expectancy, having children and being male (were negatively associated with the number of years traded-off. Conclusion Age, gender and subjective life expectancy, living together and having children were significantly associated with TTO responses. Consideration of significant others in TTO exercises thus may be important in understanding (differences in) TTO responses and when drawing representative samples from the general public. Electronic supplementary material The online version of this article (doi:10.1186/s12955-015-0276-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- F E van Nooten
- Institute of Health Policy & Management (iBMG) and Institute of Medical Technology Assessment (iMTA), Erasmus University Rotterdam, Rotterdam, The Netherlands
| | - N J A van Exel
- Institute of Health Policy & Management (iBMG) and Institute of Medical Technology Assessment (iMTA), Erasmus University Rotterdam, Rotterdam, The Netherlands
| | - X Koolman
- Department of Health Sciences, VU Amsterdam, Amsterdam, The Netherlands
| | - W B F Brouwer
- Institute of Health Policy & Management (iBMG) and Institute of Medical Technology Assessment (iMTA), Erasmus University Rotterdam, Rotterdam, The Netherlands. .,iBMG/iMTA, Erasmus University Rotterdam, PO Box 1738, 3000DR, Rotterdam, The Netherlands.
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Pinto-Prades JL, Rodríguez-Míguez E. The lead time tradeoff: the case of health states better than dead. Med Decis Making 2014; 35:305-15. [PMID: 25009190 DOI: 10.1177/0272989x14541952] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Lead time tradeoff (L-TTO) is a variant of the time tradeoff (TTO). L-TTO introduces a lead period in full health before illness onset, avoiding the need to use 2 different procedures for states better and worse than dead. To estimate utilities, additive separability is assumed. We tested to what extent violations of this assumption can bias utilities estimated with L-TTO. METHODS A sample of 500 members of the Spanish general population evaluated 24 health states, using face-to-face interviews. A total of 188 subjects were interviewed with L-TTO and the rest with TTO. Both samples evaluated the same set of 24 health states, divided into 4 groups with 6 health states per set. Each subject evaluated 1 of the sets. A random effects regression model was fitted to our data. Only health states better than dead were included in the regression since it is in this subset where additive separability can be tested clearly. RESULTS Utilities were higher in L-TTO in relation to TTO (on average L-TTO adds about 0.2 points to the utility of health states), suggesting that additive separability is violated. The difference between methods increased with the severity of the health state. Thus, L-TTO adds about 0.14 points to the average utility of the less severe states, 0.23 to the intermediate states, and 0.28 points to the more severe estates. CONCLUSIONS L-TTO produced higher utilities than TTO. Health problems are perceived as less severe if a lead period in full health is added upfront, implying that there are interactions between disjointed time periods. The advantages of this method have to be compared with the cost of modeling the interaction between periods.
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