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Kale MS, Sigel K, Arora A, Ferket BS, Wisnivesky J, Kong CY. The Benefits and Harms of Lung Cancer Screening in Individuals With Comorbidities. JTO Clin Res Rep 2024; 5:100635. [PMID: 38450056 PMCID: PMC10915410 DOI: 10.1016/j.jtocrr.2024.100635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 11/09/2023] [Accepted: 01/06/2024] [Indexed: 03/08/2024] Open
Abstract
Introduction Individuals with a history of smoking and a high risk of lung cancer often have a high prevalence of smoking-related comorbidities. The presence of these comorbidities might alter the benefit-to-harm ratio of lung cancer screening by influencing the risk of complications, quality of life, and competing risks of death. Nevertheless, individuals with chronic diseases are underrepresented in screening clinical trials. In this study, we use microsimulation modeling to determine the impact of chronic diseases on lung cancer benefits and harms. Methods We extended a validated lung cancer screening microsimulation model that comprehensively recapitulates an individual's lung cancer development, progression, detection, follow-up, treatment, and survival. We parameterized the model to reflect the impact of chronic diseases on complications from invasive testing, quality of life, and mortality in individuals in five-year age categories between the ages of 50 and 80 years. Outcomes included life-years (LY) gained per 100,000 in patients with chronic obstructive pulmonary disease, diabetes mellitus, heart disease, and history of stroke compared with screening-eligible individuals without comorbidities. Results Among individuals between the ages of 50 and 54 years, we found that the presence of a comorbidity altered the LY gained from screening per 100,000 individuals depending on the comorbidity: 4296 LY with no comorbidities; 3462 LY, 3260 LY, 3031 LY, and 3257 LY with chronic obstructive pulmonary disease, heart disease, diabetes mellitus, and stroke, respectively. We observed greater reductions in LY gained in individuals with two comorbidities; we observed similar patterns for individuals between the ages of 55 and 59 years, 60 and 64 years, 65 and 69 years, 70 and 74 years, and 75 and 80 years. Conclusions Comorbidities reduce LY gained from screening per 100,000 compared with no comorbidities, and our results can be used by clinicians when discussing the benefits and harms of screening in their patients with comorbidities.
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Affiliation(s)
- Minal S. Kale
- Department of Medicine, Division of General Internal Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Keith Sigel
- Department of Medicine, Division of General Internal Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
- Division of Infectious Diseases, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Arushi Arora
- Department of Medicine, Division of General Internal Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
- Department of Geriatrics, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Bart S. Ferket
- Institute for Healthcare Delivery Science, Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, New York
- Tisch Cancer Institute, Mount Sinai Health System, New York, New York
| | - Juan Wisnivesky
- Department of Medicine, Division of General Internal Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
- Division of Pulmonary, Critical Care, and Sleep Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Chung Yin Kong
- Department of Medicine, Division of General Internal Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
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2
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Robinson SA, Moy ML, Ney JP. Value of Information Analysis of a Web-Based Self-Management Intervention for Chronic Obstructive Pulmonary Disease. Telemed J E Health 2024; 30:518-526. [PMID: 37615601 PMCID: PMC10877383 DOI: 10.1089/tmj.2023.0010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 06/14/2023] [Accepted: 06/19/2023] [Indexed: 08/25/2023] Open
Abstract
Objective: Technology-based programs can be cost-effective in the management of chronic obstructive pulmonary disease (COPD). However, cost-effectiveness estimates always contain some uncertainty, and decisions based upon them carry some risk. We conducted a value of information (VOI) analysis to estimate the value of additional research of a web-based self-management intervention for COPD to reduce the costs associated with uncertainty. Methods: We used a 10,000-iteration cost-effectiveness model from the health care payer perspective to calculate the expected value of perfect information (EVPI) at the patient- and population-level. An opportunity loss was incurred when the web-based intervention did not produce a greater net monetary benefit than usual care in an iteration. We calculated the probability of opportunity loss and magnitude of opportunity costs as a function of baseline health utility. We aggregated opportunity costs over the projected incident population of inpatient COPD patients over 10 years and estimated it as a function of the willingness-to-pay (WTP) threshold. Costs are in 2022 U.S. Dollars. Results: Opportunity losses were found in 22.7% of the iterations. The EVPIpatient was $78 per patient (95% confidence interval: $75-$82). The probability that the intervention was the optimal strategy varied across baseline health utilities. The EVPIpopulation was $506,666,882 over 10 years for a WTP of $50,000. Conclusions: Research estimated to cost up to $500 million would be warranted to reduce uncertainty. Future research could focus on identifying the impact of baseline health utilities to maximize the cost savings of the intervention. Other considerations for future research priorities include implementation efforts for technology-based interventions.
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Affiliation(s)
- Stephanie A. Robinson
- Center for Healthcare Organization and Implementation Research, VA Bedford Healthcare System, Bedford, Massachusetts, USA
- The Pulmonary Center, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Marilyn L. Moy
- Pulmonary and Critical Care Medicine Section, VA Boston Healthcare System, Boston, Massachusetts, USA
- Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - John P. Ney
- VA Connecticut Healthcare System, West Haven, Connecticut, USA
- Department of Neurology, Boston University School of Medicine, Boston, Massachusetts, USA
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3
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Bindra J, Chopra I, Hayes K, Niewoehner J, Panaccio M, Wan GJ. Cost-Effectiveness of Acthar Gel Versus Standard of Care for the Treatment of Exacerbations in Moderate-to-Severe Systemic Lupus Erythematosus. Adv Ther 2023; 40:194-210. [PMID: 36266383 PMCID: PMC9859852 DOI: 10.1007/s12325-022-02332-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 09/21/2022] [Indexed: 01/28/2023]
Abstract
INTRODUCTION Despite current standard of care (SoC), there is an unmet need for the treatment of active systemic lupus erythematosus (SLE). The study assessed the cost-effectiveness of Acthar® Gel (repository corticotropin injection) versus SoC treatment in patients with active, moderate-to-severe SLE from the US payer and societal perspectives over 2 and 3 years. METHODS Cost-effectiveness model was developed using a probabilistic cohort-level state-transition approach. Patients received Acthar Gel in an exacerbation state, and the outcomes were assessed at the end of a 3-month cycle for response achievement based on the probability of treatment success with Acthar Gel. Patients may sustain the response or experience an exacerbation. For the base case scenario, moderate-to-severe SLE was defined as British Isles Lupus Assessment Group (BILAG)-2004 ≥ 20 or SLE Disease Activity Index 2000 (SLEDAI-2K) ≥ 10 and clinical response was based on SLE responder index (SRI)-4. Clinical response, productivity loss, and utility were derived from a phase 4 SLE trial; cost and disutility estimates were sourced from the literature. RESULTS From a payer perspective, Acthar Gel versus SoC resulted in an incremental cost-effectiveness ratio (ICER) of $133,110 per quality-adjusted life-year (QALY) and $94,818 per QALY over 2 and 3 years, respectively. From a societal perspective, Acthar Gel versus SoC results in an ICER of $70,827 per QALY and $32,525 per QALY over 2 and 3 years, respectively. Results from the sensitivity and scenario analyses are consistent with those of the base case model. CONCLUSIONS Acthar Gel is a cost-effective, value-based treatment option for appropriate patients with moderate-to-severe SLE at a willingness-to-pay threshold of $150,000 over 2-3 years from the US payer and societal perspectives. Acthar Gel results in the reduction of direct medical and indirect costs.
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Affiliation(s)
- Jas Bindra
- Falcon Research Group, North Potomac, MD USA
| | | | - Kyle Hayes
- Mallinckrodt Pharmaceuticals, 53 Frontage Road, Hampton, NJ 08827 USA
| | - John Niewoehner
- Mallinckrodt Pharmaceuticals, 53 Frontage Road, Hampton, NJ 08827 USA
| | - Mary Panaccio
- Mallinckrodt Pharmaceuticals, 53 Frontage Road, Hampton, NJ 08827 USA
| | - George J. Wan
- Mallinckrodt Pharmaceuticals, 53 Frontage Road, Hampton, NJ 08827 USA
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4
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Joundi RA, Adekanye J, Leung AA, Ronksley P, Smith EE, Rebchuk AD, Field TS, Hill MD, Wilton SB, Bresee LC. Health State Utility Values in People With Stroke: A Systematic Review and Meta-Analysis. J Am Heart Assoc 2022; 11:e024296. [PMID: 35730598 PMCID: PMC9333363 DOI: 10.1161/jaha.121.024296] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 02/21/2022] [Indexed: 12/25/2022]
Abstract
Background Health state utility values are commonly used to provide summary measures of health-related quality of life in studies of stroke. Contemporaneous summaries are needed as a benchmark to contextualize future observational studies and inform the effectiveness of interventions aimed at improving post-stroke quality of life. Methods and Results We conducted a systematic search of the literature using Medline, EMBASE, and Web of Science from January 1995 until October 2020 using search terms for stroke, health-related quality of life, and indirect health utility metrics. We calculated pooled estimates of health utility values for EQ-5D-3L, EQ-5D-5L, AQoL, HUI2, HUI3, 15D, and SF-6D using random effects models. For the EQ-5D-3L we conducted stratified meta-analyses and meta-regression by key subgroups. We screened 14 251 abstracts and 111 studies met our inclusion criteria (sample size range 11 to 12 447). EQ-5D-3L was reported in 78% of studies (study n=87; patient n=56 976). The pooled estimate for EQ-5D-3L at ≥3 months following stroke was 0.65 (95% CI, 0.63-0.67), which was ≈20% below population norms. There was high heterogeneity (I2>90%) between studies, and estimates differed by study size, case definition of stroke, and country of study. Women, older individuals, those with hemorrhagic stroke, and patients prior to discharge had lower pooled EQ-5D-3L estimates. Conclusions Pooled estimates of health utility for stroke survivors were substantially below population averages. We provide reference values for health utility in stroke to support future clinical and economic studies and identify subgroups with lower healthy utility. Registration URL: https://www.crd.york.ac.uk/prospero/. Unique Identifier: CRD42020215942.
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Affiliation(s)
- Raed A. Joundi
- Department of Clinical NeurosciencesUniversity of CalgaryAlbertaCanada
- Division of NeurologyHamilton Health SciencesMcMaster University & Population Health Research InstituteHamiltonOntarioCanada
| | | | | | | | | | | | - Thalia S. Field
- University of British ColumbiaVancouverBritish ColumbiaCanada
| | | | | | - Lauren C. Bresee
- Department of Community Health SciencesUniversity of CalgaryAlbertaCanada
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Hoogendoorn M, Jowett S, Dickens AP, Jordan R, Enocson A, Adab P, Versteegh M, Mölken MRV. Performance of the EQ-5D-5L Plus Respiratory Bolt-On in the Birmingham Chronic Obstructive Pulmonary Disease Cohort Study. VALUE IN HEALTH : THE JOURNAL OF THE INTERNATIONAL SOCIETY FOR PHARMACOECONOMICS AND OUTCOMES RESEARCH 2021; 24:1667-1675. [PMID: 34711368 DOI: 10.1016/j.jval.2021.05.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 04/30/2021] [Accepted: 05/10/2021] [Indexed: 06/13/2023]
Abstract
OBJECTIVES A respiratory bolt-on dimension for the EQ-5D-5L has recently been developed and valued by the general public. This study aimed to validate the EQ-5D-5L plus respiratory dimension (EQ-5D-5L+R) in a large group of patients with chronic obstructive pulmonary disease (COPD). METHODS Validation was undertaken with data from the Birmingham COPD Cohort Study, a longitudinal UK study of COPD primary care patients. Data on the EQ-5D-5L+R were collected from 1008 responding participants during a follow-up questionnaire in 2017 and combined with (previously collected) data on patient and disease characteristics. Descriptive and correlation analyses were performed on the EQ-5D-5L+R dimensions and utilities, in relation to COPD characteristics and compared with the EQ-5D-5L without respiratory dimension. Multivariate regression models were estimated to test whether regression coefficients of clinical characteristics differed between the EQ-5D-5L+R utility and the EQ-5D-5L utility. RESULTS Correlation coefficients for the EQ-5D-5L+R utility with COPD parameters were slightly higher than the EQ-5D-5L utility. Both instruments displayed discriminant validity but analyses in clinical subgroups of patients showed larger absolute differences in utilities for the EQ-5D-5L+R. In the multivariate analyses, only the coefficient for the COPD Assessment Test score was higher for the model using the EQ-5D-5L+R utility as outcome. CONCLUSIONS This study showed that the addition of a respiratory domain to the EQ-5D-5L led to small improvements in the instrument's performance. Comparability of the EQ-5D across diseases, currently considered one of its strengths, would have to be traded off against a modest improvement in utility difference when adding the respiratory dimension.
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Affiliation(s)
- Martine Hoogendoorn
- Institute for Medical Technology Assessment (IMTA), Erasmus University Rotterdam, Rotterdam, The Netherlands.
| | - Susan Jowett
- Health Economics Unit, University of Birmingham, Birmingham, England, UK
| | - Andrew P Dickens
- Institute of Applied Health Research, University of Birmingham, Birmingham, England, UK
| | - Rachel Jordan
- Institute of Applied Health Research, University of Birmingham, Birmingham, England, UK
| | - Alexandra Enocson
- Institute of Applied Health Research, University of Birmingham, Birmingham, England, UK
| | - Peymane Adab
- Institute of Applied Health Research, University of Birmingham, Birmingham, England, UK
| | - Matthijs Versteegh
- Institute for Medical Technology Assessment (IMTA), Erasmus University Rotterdam, Rotterdam, The Netherlands
| | - Maureen Rutten-van Mölken
- Institute for Medical Technology Assessment (IMTA), Erasmus University Rotterdam, Rotterdam, The Netherlands; Erasmus School of Health Policy and Management (ESHPM), Erasmus University Rotterdam, Rotterdam, The Netherlands
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6
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Askın M, Koc EM, Sozmen K, Turan MO, Soypacacı Z, Aksun S. Evaluation of Dipper and Non-dipper Blood Pressure Patterns and Quality of Life Among Patients with Chronic Obstructive Pulmonary Disease. Arq Bras Cardiol 2021; 116:295-302. [PMID: 33470331 PMCID: PMC7909972 DOI: 10.36660/abc.20190536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 01/22/2020] [Indexed: 11/18/2022] Open
Abstract
Fundamento O padrão pressórico não-dipper é definido por uma redução inferior a 10% na pressão arterial noturna e está associado a doenças cardiovasculares. Acredita-se que a inflamação desempenhe um papel na patogênese da doença pulmonar obstrutiva crônica (DPOC) e no padrão pressórico não-dipper e ambas as doenças estão associadas a uma qualidade de vida mais baixa. Objetivo O objetivo deste estudo foi o de investigar os efeitos do padrão pressórico não-dipper em pacientes com DPOC. Métodos Foi realizado um estudo transversal incluindo 142 pacientes com DPOC. O Questionário Respiratório de Saint George e a Escala de Qualidade de Vida Euro foram utilizados para a coleta de dados. Para entender a rigidez arterial, o índice de aumento e a velocidade da onda de pulso foram medidos; subsequentemente, foi realizada a monitorização ambulatorial da pressão arterial de 24 horas. Foi aplicado um modelo de regressão logística multivariável para entender a relação entre as diferentes variáveis independentes e o padrão pressórico. Foram considerados estatisticamente significativos valores de p inferiores a 0,05. Resultados Como resultado, 76,1% (n = 108) dos pacientes apresentaram o padrão pressórico não-dipper. Os pacientes com padrão não-dipper apresentaram valores mais altos de proteína C reativa (OR: 1,123; IC 95%: 1,016;1,242), índice de aumento (OR: 1,057; IC 95%: 1,011;1,105) e pontuação total no Questionário Respiratório de Saint George (OR: 1,021; IC 95%: 1,001;1,042), em comparação com os pacientes com padrão dipper. Adicionalmente, com o aumento do número de pessoas que habitavam o domicílio, verificou-se que o padrão pressórico não-dipper era mais frequente (OR: 1,339; IC 95%:1,009;1,777). Conclusão O padrão pressórico não-dipper pode aumentar o risco cardiovascular ao desencadear a inflamação e pode afetar adversamente o prognóstico da DPOC diminuindo a qualidade de vida relacionada à doença. (Arq Bras Cardiol. 2020; [online].ahead print, PP.0-0)
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Affiliation(s)
- Meryem Askın
- Izmir Katip Celebi University Faculty of Medicine - Department of Family Medicine, Izmir - Turquia
| | - Esra Meltem Koc
- Izmir Katip Celebi University Faculty of Medicine - Department of Family Medicine, Izmir - Turquia
| | - Kaan Sozmen
- Izmir Katip Celebi University Faculty of Medicine - Department of Public Health, Izmir - Turquia
| | - Muzaffer Onur Turan
- Izmir Katip Celebi University Faculty of Medicine - Department of Chest Diseases,Izmir - Turquia
| | - Zeki Soypacacı
- Izmir Katip Celebi University Faculty of Medicine - Department of Nephrology, Izmir - Turquia
| | - Saliha Aksun
- Izmir Katip Celebi University Faculty of Medicine - Department of Medical Biochemistry, Izmir - Turquia
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7
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Yang Z, Li S, Wang X, Chen G. Health state utility values derived from EQ-5D in psoriatic patients: a systematic review and meta-analysis. J DERMATOL TREAT 2020; 33:1029-1036. [PMID: 32716651 DOI: 10.1080/09546634.2020.1800571] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND To determine pooled EQ-5D utility scores for psoriasis as a general condition, plaque psoriasis, and psoriatic arthritis. METHODS A systematic review and meta-analysis of EQ-5D utility scores for psoriatic patients was conducted. Univariate meta-regression was used to explore the degree of heterogeneity. RESULTS Seventy-five studies were included in the systematic review. The EQ-5D in psoriatic patients demonstrated decent convergent, known-groups validity, and a degree of responsiveness with a ceiling effect. Among the five EQ-5D dimensions, 'self-care' showed the lowest and 'pain/discomfort' showed the highest percentages of reporting any problems. For meta-analysis, we identified 70 utility scores from 59 studies: 22 for plaque psoriasis, 26 for psoriasis as a general condition, and 22 for psoriatic arthritis. The mean (95% CIs; I2) of the EQ-5D utility scores for psoriasis as a general condition, plaque psoriasis, and psoriatic arthritis was 0.748 (0.718, 0.777; 98.8%), 0.755 (0.727, 0.783; 98.6%), and 0.585 (0.538, 0.632; 98.2%), respectively. For psoriasis as a general condition and plaque psoriasis, factors such as country, psoriasis area and severity index (PASI), dermatology life quality index (DLQI) and questionnaire version (EQ-5D-3L or EQ-5D-5L) all significantly influenced the utility scores. CONCLUSION Psoriasis imposes a substantial impairment on patients' quality of life, especially the pain/discomfort dimension. Heterogeneity exists among different EQ-5D utility values found in the literature.
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Affiliation(s)
- Zhonghua Yang
- School of Health Care Management, Cheeloo College of Medicine, Shandong University, Jinan, China.,Sichuan Development Centre for Health Aging, Chengdu, China.,NHC Key Laboratory of Health Economics and Policy Research (Shandong University), Jinan, China
| | - Shunping Li
- School of Health Care Management, Cheeloo College of Medicine, Shandong University, Jinan, China.,NHC Key Laboratory of Health Economics and Policy Research (Shandong University), Jinan, China
| | - Xuewen Wang
- School of Health Care Management, Cheeloo College of Medicine, Shandong University, Jinan, China.,NHC Key Laboratory of Health Economics and Policy Research (Shandong University), Jinan, China
| | - Gang Chen
- Centre for Health Economics, Monash Business School, Monash University, Melbourne, Australia
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Bae E, Choi SE, Lee H, Shin G, Kang D. Validity of EQ-5D utility index and minimal clinically important difference estimation among patients with chronic obstructive pulmonary disease. BMC Pulm Med 2020; 20:73. [PMID: 32293387 PMCID: PMC7092534 DOI: 10.1186/s12890-020-1116-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Accepted: 03/16/2020] [Indexed: 01/21/2023] Open
Abstract
Background The discriminatory ability of multi-attribute utility (MAU) measures compared to condition-specific measures (CSM) in assessing health-related quality of life (HRQoL) among patients with chronic obstructive pulmonary disease (COPD) is an unsettled issue. This study investigated the quality of life of patients with COPD with three different HRQoL instruments and examined whether they could differentiate between adjacent severity groups in a statistically and clinically meaningful manner. In the process, the minimal clinically important differences (MCID) of the EQ-5D utility index were estimated. Methods Cross-sectional survey data were collected from patients with mild to very severe COPD in South Korea. In addition to demographic and clinical information, the following HRQoL questionnaires were used: The three-level five-dimensional Euro-Quality of Life tool (EQ-5D-3L), the EQ-Visual Analog Scale (EQ-VAS), and the Chronic Obstructive Pulmonary Disease Assessment Test (CAT). Patients’ health-related quality of life was analyzed with reference to severity groups based on the Global Initiative for Chronic Obstructive Lung Disease (GOLD) classification. To investigate the discriminatory ability of the HRQoL instruments between COPD severity groups, tests examining variance, covariance, and standardized mean difference were performed. After estimating the MCID of the EQ-5D utility index using the anchor-based method, we investigated whether the differences in the EQ-5D utility scores between groups exceeded the clinically meaningful minimum level. Results A total of 298 patients completed this study. All the quality of life scores showed statistically significant differences between the GOLD severity groups. The pooled MCID estimate for the EQ-5D utility index was 0.028 (range: 0.017–0.033). Even after adjusting for other factors affecting quality of life, the EQ-5D utility index differentiated the GOLD groups well. Conclusions We conclude that the EQ-5D utility index is a valid instrument for measuring the quality of life of patients with COPD, and the pooled MCID estimate for the EQ-5D utility index was 0.028.
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Affiliation(s)
- Eunmi Bae
- College of Pharmacy, Korea University, 2511 Sejong-ro, Sejong, 30019, South Korea
| | - Sang-Eun Choi
- College of Pharmacy, Korea University, 2511 Sejong-ro, Sejong, 30019, South Korea.
| | - Haeyoung Lee
- University of Maryland School of Pharmacy, Baltimore, MD, USA
| | - Gyeongseon Shin
- College of Pharmacy, Korea University, 2511 Sejong-ro, Sejong, 30019, South Korea
| | - Daewon Kang
- College of Pharmacy, Korea University, 2511 Sejong-ro, Sejong, 30019, South Korea
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9
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Tjahjono R, Alvarado R, Kalish L, Sacks R, Campbell R, Marcells G, Orgain C, Harvey RJ. Health Impairment From Nasal Airway Obstruction and Changes in Health Utility Values From Septorhinoplasty. JAMA FACIAL PLAST SU 2020; 21:146-151. [PMID: 30452512 DOI: 10.1001/jamafacial.2018.1368] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Importance The association of nasal airway obstruction with health is significant, and the health care resources utilized in open septorhinoplasty need to be included in health economic analyses. Objectives To describe the association of nasal airway obstruction and subsequent open septorhinoplasty with patient health. Design, Setting, and Participants A prospective case series study was conducted from September 30, 2009, to October 29, 2015, at 2 tertiary rhinologic centers in Sydney, Australia, among 144 consecutive adult patients (age, ≥18 years) with nasal airway obstruction from septal and nasal valve disorders. Interventions Open septorhinoplasty. Main Outcomes and Measures Patients were assessed before undergoing open septorhinoplasty and then 6 months after the procedure. Health utility values (HUVs) were derived from the 36-Item Short Form Health Survey. Nasal obstruction severity was also measured using the Nasal Obstruction Symptom Evaluation (NOSE) questionnaire and the Sino-Nasal Outcome Test 22 questionnaires. Results A total of 144 patients (85 women and 59 men; mean [SD] age, 38 [13] years) were assessed. The baseline mean (SD) HUV for patients in this study was 0.72 (0.09), which was below the weighted mean (SD) Australian norm of 0.81 (0.22). After open septorhinoplasty, the mean (SD) HUV improved to 0.78 (0.12) (P < .001). Improvements in HUV were associated with changes in disease-specific patient-reported outcome measures, including Nasal Obstruction Symptom Evaluation scores (r = -0.48; P = .01) and Sino-Nasal Outcome Test 22 scores (r = -0.68; P = .01). Conclusions and Relevance Patients with nasal airway obstruction reported baseline HUVs that were lower than the Australian norm and similar to those in individuals with chronic diseases with significant health expenditure. There was a clinically and statistically significant improvement in HUVs after open septorhinoplasty that was associated with a reduction in Nasal Obstruction Symptom Evaluation and Sino-Nasal Outcome Test 22 scores. Outcomes from this study may be used for health economic analyses of the benefit associated with open septorhinoplasty. Level of Evidence 4.
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Affiliation(s)
- Richard Tjahjono
- Rhinology and Skull Base Research Group, Applied Medical Research Centre, University of New South Wales, Sydney, Australia.,University of Sydney Medical School, Sydney, Australia
| | - Raquel Alvarado
- Rhinology and Skull Base Research Group, Applied Medical Research Centre, University of New South Wales, Sydney, Australia
| | - Larry Kalish
- Rhinology and Skull Base Research Group, Applied Medical Research Centre, University of New South Wales, Sydney, Australia.,University of Sydney Medical School, Sydney, Australia
| | - Raymond Sacks
- Rhinology and Skull Base Research Group, Applied Medical Research Centre, University of New South Wales, Sydney, Australia.,University of Sydney Medical School, Sydney, Australia.,Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
| | - Raewyn Campbell
- Rhinology and Skull Base Research Group, Applied Medical Research Centre, University of New South Wales, Sydney, Australia.,University of Sydney Medical School, Sydney, Australia
| | - George Marcells
- Rhinology and Skull Base Research Group, Applied Medical Research Centre, University of New South Wales, Sydney, Australia
| | - Carolyn Orgain
- Rhinology and Skull Base Research Group, Applied Medical Research Centre, University of New South Wales, Sydney, Australia
| | - Richard John Harvey
- Rhinology and Skull Base Research Group, Applied Medical Research Centre, University of New South Wales, Sydney, Australia.,Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
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10
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Correlation between disease severity factors and EQ-5D utilities in chronic obstructive pulmonary disease. Qual Life Res 2019; 29:607-617. [PMID: 31673922 DOI: 10.1007/s11136-019-02340-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/18/2019] [Indexed: 10/25/2022]
Abstract
PURPOSE Impaired health-related quality of life (HRQoL) is associated with poor health outcomes in chronic obstructive pulmonary disease (COPD). The aim of this study was to determine health utilities in patients with COPD and to identify the variables with the greatest impact. METHODS This is a pooled analysis of data from 4 observational studies performed in stable COPD patients. Evaluation of patient HRQoL utilities was performed using the Spanish version of the self-administered EuroQoL 5 Dimensions (EQ-5D) questionnaire. EQ-5D utilities were described and compared according to several markers of disease severity. RESULTS 6198 patients reported a mean (SD) EQ-5D index of 0.67 (0.26). A linear dose response relationship between EQ-5D utility and modified Medical Research Council (mMRC) score, forced expiratory volume in one 1 s (% predicted), COPD hospital admissions in the previous year, self-reported daily walking time, Charlson index, body mass index, obstruction, dyspnoea and exacerbation (BODEx) index, COPD assessment test (CAT), hospital anxiety and depression scale was observed (p for trend < 0.001). In multivariate analysis, patients reporting lower utility values were those with more dyspnoea, more comorbidities, using long-term oxygen therapy, with previous hospitalisations due to a COPD exacerbation and higher (worse) CAT score. CONCLUSION HRQoL measures such as EQ-5D can assist clinicians to understand the impact of respiratory disease on COPD patients.
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11
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Hoogendoorn M, Oppe M, Boland MRS, Goossens LMA, Stolk EA, Rutten-van Mölken MPMH. Exploring the Impact of Adding a Respiratory Dimension to the EQ-5D-5L. Med Decis Making 2019; 39:393-404. [PMID: 31092111 PMCID: PMC6613181 DOI: 10.1177/0272989x19847983] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Objectives. To evaluate the impact of adding a respiratory dimension (a bolt-on dimension) to the EQ-5D-5L health state valuations. Methods. Based on extensive regression and principal component analyses, 2 respiratory bolt-on candidates were formulated: R1, limitations in physical activities due to shortness of breath, and R2, breathing problems. Valuation interviews for the selected bolt-ons were performed with a representative sample from the Dutch general public using the standardized interview protocol and software of the EuroQol group. Hybrid models based on the combined time-tradeoff (TTO) and discrete choice experiment (DCE) data were estimated to assess whether the 5 levels of the respiratory bolt-on led to significant changes in utility values. Results. For each bolt-on candidate, slightly more than 200 valuation interviews were conducted. Mean TTO values and DCE choice probabilities for health states with a level 4 or 5 for the respiratory dimension were significantly lower compared with the same health states in the Dutch EQ-5D-5L valuation study without the respiratory dimension. Results of hybrid models showed that for the bolt-on “limitations in physical activities,” the utility decrements were significant for level 3 (–0.055), level 4 (–0.087), and level 5 (–0.135). For “breathing problems,” the utility decrements for the same levels were greater (–0.086, –0.219, and –0.327, respectively). Conclusions. The addition of each of the 2 respiratory bolt-ons to the EQ-5D-5L had a significant effect on the valuation of health states with severe levels for the bolt-on. The bolt-on dimension “breathing problems” showed the greatest utility decrements and therefore seems the most appropriate respiratory bolt-on dimension.
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Affiliation(s)
- Martine Hoogendoorn
- Institute for Medical Technology Assessment, Erasmus University, Rotterdam, Zuid-Holland, the Netherlands
| | - Mark Oppe
- Executive Office, EuroQol Research Foundation, Rotterdam, Zuid-Holland, the Netherlands
| | - Melinde R S Boland
- Erasmus School of Health Policy and Management, Erasmus University, Rotterdam, Zuid-Holland, the Netherlands
| | - Lucas M A Goossens
- Erasmus School of Health Policy and Management, Erasmus University, Rotterdam, Zuid-Holland, the Netherlands
| | - Elly A Stolk
- Executive Office, EuroQol Research Foundation, Rotterdam, Zuid-Holland, the Netherlands
| | - Maureen P M H Rutten-van Mölken
- Institute for Medical Technology Assessment, Erasmus University, Rotterdam, Zuid-Holland, the Netherlands.,Erasmus School of Health Policy and Management, Erasmus University, Rotterdam, Zuid-Holland, the Netherlands
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12
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Xie F, Zoratti M, Chan K, Husereau D, Krahn M, Levine O, Clifford T, Schunemann H, Guyatt G. Toward a Centralized, Systematic Approach to the Identification, Appraisal, and Use of Health State Utility Values for Reimbursement Decision Making: Introducing the Health Utility Book (HUB). Med Decis Making 2019; 39:370-378. [PMID: 30902030 DOI: 10.1177/0272989x19837969] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Cost-utility analysis (CUA) is a widely recommended form of health economic evaluation worldwide. The outcome measure in CUA is quality-adjusted life-years (QALYs), which are calculated using health state utility values (HSUVs) and corresponding life-years. Therefore, HSUVs play a significant role in determining cost-effectiveness. Formal adoption and endorsement of CUAs by reimbursement authorities motivates methodological advancement in HSUV measurement and application. A large body of evidence exploring various methods in measuring HSUVs has accumulated, imposing challenges for investigators in identifying and applying HSUVs to CUAs. First, large variations in HSUVs between studies are often reported, and these may lead to different cost-effectiveness conclusions. Second, issues concerning the quality of studies that generate HSUVs are increasingly highlighted in the literature. This issue is compounded by the limited published guidance and methodological standards for assessing the quality of these studies. Third, reimbursement decision making is a context-specific process. Therefore, while an HSUV study may be of high quality, it is not necessarily appropriate for use in all reimbursement jurisdictions. To address these issues, by promoting a systematic approach to study identification, critical appraisal, and appropriate use, we are developing the Health Utility Book (HUB). The HUB consists of an HSUV registry, a quality assessment tool for health utility studies, and a checklist for interpreting their use in CUAs. We anticipate that the HUB will make a timely and important contribution to the rigorous conduct and proper use of health utility studies for reimbursement decision making. In this way, health care resource allocation informed by HSUVs may reflect the preferences of the public, improve health outcomes of patients, and maintain the efficiency of health care systems.
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Affiliation(s)
- Feng Xie
- Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada.,Program for Health Economics and Outcome Measures (PHENOM), Hamilton, ON, Canada.,Centre for Health Economics and Policy Analysis, McMaster University, Hamilton, ON, Canada
| | - Michael Zoratti
- Department of Health Research Methods, Evidence and Impact (formerly Clinical Epidemiology and Biostatistics), McMaster University, Hamilton, ON, Canada
| | - Kelvin Chan
- Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON, Canada.,Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada
| | - Don Husereau
- Institute of Health Economics, Edmonton, Alberta, Canada.,Faculty of Health Sciences, University of Ottawa, Ottawa, ON, Canada
| | - Murray Krahn
- Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON, Canada
| | - Oren Levine
- Department of Oncology, McMaster University, Hamilton, ON, Canada
| | - Tammy Clifford
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada
| | - Holger Schunemann
- Department of Health Research Methods, Evidence and Impact (formerly Clinical Epidemiology and Biostatistics), McMaster University, Hamilton, ON, Canada
| | - Gordon Guyatt
- Department of Health Research Methods, Evidence and Impact (formerly Clinical Epidemiology and Biostatistics), McMaster University, Hamilton, ON, Canada
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13
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Comparison between the EQ-5D-3L and the SF-6D quality of life (QOL) questionnaires in patients with chronic obstructive pulmonary disease (COPD) undergoing lung volume reduction surgery (LVRS). Qual Life Res 2019; 28:1885-1892. [DOI: 10.1007/s11136-019-02123-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/28/2019] [Indexed: 12/19/2022]
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14
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Zhou T, Guan H, Yao J, Xiong X, Ma A. The quality of life in Chinese population with chronic non-communicable diseases according to EQ-5D-3L: a systematic review. Qual Life Res 2018; 27:2799-2814. [PMID: 29980994 PMCID: PMC6208588 DOI: 10.1007/s11136-018-1928-y] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/26/2018] [Indexed: 12/11/2022]
Abstract
PURPOSE Over the past decade, a changing spectrum of disease has turned chronic non-communicable diseases (CNCDs) into the leading cause of death worldwide. During the 2015 in China, there were more than 6.6 million deaths from NCDs, which was the highest rate around the world. In the present study, we performed a systematic review to analyze the health-related quality of life (HRQoL) according to EQ-5D-3L instrument in patients with different kinds of CNCDs in China. METHODS We searched PubMed, Embase, Web of Science, Cochrane Library, VIP, WanFang Data, and CNKI databases up to April 12, 2018, to identify all relevant studies that reported on HRQoL assessed by EQ-5D-3L instrument in Chinese patients with CNCDs. Expert consultation and hand-searching of reference lists from retrieved studies were employed to identify additional references. The variation of mean utility values, EQ-VAS score ranges, and responses for each EQ-5D dimension described in relevant studies were extracted. RESULTS A total of 5027 English-language articles and 618 Chinese-language articles were identified, among which 38 articles met full inclusion criteria. These 38 studies involved 18 kinds of CNCDs. In this review, the health utility for diabetes mellitus ranged from 0.79 to 0.94 (EQ-5D VAS scores from 61.5 to 78.6), hypertension from 0.78 to 0.93 (70.1-77.4), coronary heart disease from 0.75 to 0.90 (71.0-77.0), chronic obstructive pulmonary disease from 0.64 to 0.80 (55.0-67.0), epilepsy from 0.83 to 0.87 (78.3-79.6), cerebral infarction from 0.51 to 0.75 (49.7-79.0), while children cerebral palsy was 0.44 (27.3). CONCLUSIONS EQ-5D-3L is widely used in studies of HRQoL associated with CNCDs in China. Our results suggest that many factors may influence the measurement results of health utilities, including age, gender, sample source, comorbidities, rural/urban, and EQ-5D-3L value sets.
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Affiliation(s)
- Ting Zhou
- School of International Pharmaceutical Business, China Pharmaceutical University, No. 639 Longmian Avenue, Jiangning District, Nanjing, 211198 Jiangsu China
| | - Haijing Guan
- China Center for Health Economic Research, Peking University, Beijing, China
- School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Jiaqi Yao
- School of International Pharmaceutical Business, China Pharmaceutical University, No. 639 Longmian Avenue, Jiangning District, Nanjing, 211198 Jiangsu China
| | - Xiaomo Xiong
- School of International Pharmaceutical Business, China Pharmaceutical University, No. 639 Longmian Avenue, Jiangning District, Nanjing, 211198 Jiangsu China
| | - Aixia Ma
- School of International Pharmaceutical Business, China Pharmaceutical University, No. 639 Longmian Avenue, Jiangning District, Nanjing, 211198 Jiangsu China
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15
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Petrou S, Kwon J, Madan J. A Practical Guide to Conducting a Systematic Review and Meta-analysis of Health State Utility Values. PHARMACOECONOMICS 2018; 36:1043-1061. [PMID: 29750430 DOI: 10.1007/s40273-018-0670-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Economic analysts are increasingly likely to rely on systematic reviews and meta-analyses of health state utility values to inform the parameter inputs of decision-analytic modelling-based economic evaluations. Beyond the context of economic evaluation, evidence from systematic reviews and meta-analyses of health state utility values can be used to inform broader health policy decisions. This paper provides practical guidance on how to conduct a systematic review and meta-analysis of health state utility values. The paper outlines a number of stages in conducting a systematic review, including identifying the appropriate evidence, study selection, data extraction and presentation, and quality and relevance assessment. The paper outlines three broad approaches that can be used to synthesise multiple estimates of health utilities for a given health state or condition, namely fixed-effect meta-analysis, random-effects meta-analysis and mixed-effects meta-regression. Each approach is illustrated by a synthesis of utility values for a hypothetical decision problem, and software code is provided. The paper highlights a number of methodological issues pertinent to the conduct of meta-analysis or meta-regression. These include the importance of limiting synthesis to 'comparable' utility estimates, for example those derived using common utility measurement approaches and sources of valuation; the effects of reliance on limited or poorly reported published data from primary utility assessment studies; the use of aggregate outcomes within analyses; approaches to generating measures of uncertainty; handling of median utility values; challenges surrounding the disentanglement of utility estimates collected serially within the context of prospective observational studies or prospective randomised trials; challenges surrounding the disentanglement of intervention effects; and approaches to measuring model validity. Areas of methodological debate and avenues for future research are highlighted.
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Affiliation(s)
- Stavros Petrou
- Warwick Clinical Trials Unit, Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK.
| | - Joseph Kwon
- School of Health and Related Research, The University of Sheffield, 30 Regent St, Sheffield, S1 4DA, UK
| | - Jason Madan
- Warwick Clinical Trials Unit, Warwick Medical School, University of Warwick, Coventry, CV4 7AL, UK
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16
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Zhang Y, Morgan RL, Alonso-Coello P, Wiercioch W, Bała MM, Jaeschke RR, Styczeń K, Pardo-Hernandez H, Selva A, Ara Begum H, Morgano GP, Waligóra M, Agarwal A, Ventresca M, Strzebońska K, Wasylewski MT, Blanco-Silvente L, Kerth JL, Wang M, Zhang Y, Narsingam S, Fei Y, Guyatt G, Schünemann HJ. A systematic review of how patients value COPD outcomes. Eur Respir J 2018; 52:13993003.00222-2018. [PMID: 30002103 DOI: 10.1183/13993003.00222-2018] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Accepted: 05/21/2018] [Indexed: 01/06/2023]
Abstract
Our objective was to summarise systematically all research evidence related to how patients value outcomes in chronic obstructive pulmonary disease (COPD).We conducted a systematic review (systematic review registration number CRD42015015206) by searching PubMed, Embase, PsycInfo and CINAHL, and included reports that assessed the relative importance of outcomes from COPD patients' perspective. Two authors independently determined the eligibility of studies, abstracted the eligible studies and assessed risk of bias. We narratively summarised eligible studies, meta-analysed utilities for individual outcomes and assessed the certainty of evidence using the Grading of Recommendations, Assessment, Development and Evaluations approach.We included 217 quantitative studies. Investigators most commonly used utility measurements of outcomes (n=136), discrete choice exercises (n=13), probability trade-off (n=4) and forced choice techniques (n=46). Patients rated adverse events as important but on average, less so than symptom relief. Exacerbation and hospitalisation due to exacerbation are the outcomes that COPD patients rate as most important. This systematic review provides a comprehensive registry of related studies.
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Affiliation(s)
- Yuan Zhang
- Dept of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada
| | - Rebecca L Morgan
- Dept of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada
| | - Pablo Alonso-Coello
- Dept of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada.,Iberoamerican Cochrane Centre, CIBERESP-IIB Sant Pau, Barcelona, Spain
| | - Wojtek Wiercioch
- Dept of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada
| | - Małgorzata M Bała
- Dept of Hygiene and Dietetics, Faculty of Medicine, Jagiellonian University Medical College, Krakow, Poland
| | - Rafał R Jaeschke
- Section of Affective Disorders, Dept of Psychiatry, Jagiellonian University Medical College, Krakow, Poland
| | - Krzysztof Styczeń
- Section of Affective Disorders, Dept of Psychiatry, Jagiellonian University Medical College, Krakow, Poland
| | | | - Anna Selva
- Clinical Epidemiology and Cancer Screening, Corporació Sanitària Parc Taulí, Sabadell, Spain.,Research Network on Health Services in Chronic Diseases (REDISSEC), Spain
| | - Housne Ara Begum
- Dept of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada
| | - Gian Paolo Morgano
- Dept of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada
| | - Marcin Waligóra
- REMEDY, Research Ethics in Medicine Study Group, Dept of Philosophy and Bioethics, Jagiellonian University Medical College, Krakow, Poland
| | - Arnav Agarwal
- Dept of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada.,School of Medicine, University of Toronto, Toronto, ON, Canada
| | - Matthew Ventresca
- Dept of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada
| | - Karolina Strzebońska
- REMEDY, Research Ethics in Medicine Study Group, Dept of Philosophy and Bioethics, Jagiellonian University Medical College, Krakow, Poland
| | - Mateusz T Wasylewski
- REMEDY, Research Ethics in Medicine Study Group, Dept of Philosophy and Bioethics, Jagiellonian University Medical College, Krakow, Poland
| | - Lídia Blanco-Silvente
- TransLab Research Group, Dept of Medical Sciences, University of Girona, Girona, Spain
| | - Janna-Lina Kerth
- Dept for Medical Didactics and Curricular Development, Medical Faculty RWTH Aachen University, Aachen, Germany
| | - Mengxiao Wang
- Dept of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada
| | - Yuqing Zhang
- Dept of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada
| | - Saiprasad Narsingam
- Dept of Medicine, Dartmouth Medical School, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA
| | - Yutong Fei
- Centre for Evidence-Based Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Gordon Guyatt
- Dept of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada.,Dept of Medicine, McMaster University, Hamilton, ON, Canada
| | - Holger J Schünemann
- Dept of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada.,Dept of Medicine, McMaster University, Hamilton, ON, Canada
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