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Decision Analysis: Aspects of Medical Decision Making Gordon Hazen Northwestern University.

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Presentation on theme: "Decision Analysis: Aspects of Medical Decision Making Gordon Hazen Northwestern University."— Presentation transcript:

1 Decision Analysis: Aspects of Medical Decision Making Gordon Hazen Northwestern University

2 Stanford University October Contributions  Decision analysis has contributed to decision-making in business, medicine, engineering, and law medicine,

3 Stanford University October My Input to Today’s Discussion  The field of medical decision making  Relationships between medical decision analysis and the broader DA field  A nonscientific report based on my impressions only …

4 Stanford University October The Field of Medical Decision Making  Modeling to aid diagnostic and therapeutic choice by physicians and treatment choice by patients  Cost-effectiveness modeling to inform public policy  Decision psychology: Understanding/ predicting patient and physician choices

5 Stanford University October Relationships Decision Analysis Medical Decision Analysis Health Economics Statistics Decision Psychology Cost -Effectiveness Analysis

6 Stanford University October Is methodological preparation enough?  No: Medical DA researchers are almost always attached to institutions serving real-world stakeholders Bloomberg School of Public Health Center for Disease Control and Prevention Centre for Evaluation of Medicines (CEM), Cleveland Clinic Dept. of Social Medicine Erasmus University Medical School Center for Health Policy, Palo Alto, CA Institute for Health, Health Care Policy and Aging Research Mayo Clinic MD Anderson Cancer Center Merck Minneapolis VA Ctr Portland VA Medical Ctr VA San Diego Healthcare System

7 Journals  Publication of clinical decision analyses in medical journals is widespread Frequently involve decision trees dovetailing into Markov models PubMed search for 2010 with abstracts containing “Markov”: 1426 papers! PubMed search for 2010 with abstracts containing “Markov” and titles containing “Effectiveness”: 200 papers. Stanford University October 20117

8 Journals  Journals with methodological focus Medical Decision Making Value in Health International J. of Technology Assessment in Health Care Health Economics J. of Health Economics Medical Care Stanford University October 20118

9 9 Examples of research (last three issues of Medical Decision Making)  Decision Psychology Dynamics of Trust in Medical Decision Making: An Experimental Investigation into Underlying Processes The 1-in-X Effect on the Subjective Assessment of Medical Probabilities The Decision Making Control Instrument to Assess Voluntary Consent The Influence of Narrative v. Statistical Information on Perceiving Vaccination Risks Information for Decision Making by Patients With Early-Stage Prostate Cancer: A Comparison Across 9 Countries Impact on Decisions to Start or Continue Medicines of Providing Information to Patients about Possible Benefits and/or Harms: A Systematic Review and Meta-Analysis  Preferences and Utilities Estimation of a Preference-Based Carer Experience Scale Eliciting Benefit–Risk Preferences and Probability-Weighted Utility Using Choice-Format Conjoint Analysis Predicting EQ-5D Utility Scores from the Seattle Angina Questionnaire in Coronary Artery Disease: A Mapping Algorithm Using a Bayesian Framework

10 Stanford University October Examples of research (last three issues of Medical Decision Making)  Provider Decision Making How Long and How Well: Oncologists’ Attitudes Toward the Relative Value of Life- Prolonging v. Quality of Life-Enhancing Treatments Deceiving Numbers: Survival Rates and Their Impact on Doctors’ Risk Communication Electronic Notifications about Drug Substitutes Can Change Physician Prescription Habits: A Cross-Sectional Observational Study Overestimation Error and Unnecessary Antibiotic Prescriptions for Acute Cystitis in Adult Women  Shared Decision Making Longitudinal Changes in Patient Distress following Interactive Decision Aid Use among BRCA1/2 Carriers: A Randomized Trial Are There Racial Differences in Patients’ Shared Decision-Making Preferences and Behaviors among Patients with Diabetes?  Risk Communication Informing Patients: The Influence of Numeracy, Framing, and Format of Side Effect Information on Risk Perceptions Influence of Graphic Format on Comprehension of Risk Information among American Indians Graph Literacy: A Cross-Cultural Comparison

11 Stanford University October Examples of research (last three issues of Medical Decision Making)  Exploring model structure A Systematic Comparison of Microsimulation Models of Colorectal Cancer: The Role of Assumptions about Adenoma Progression Clarifying Differences in Natural History between Models of Screening: The Case of Colorectal Cancer How Does Early Detection by Screening Affect Disease Progression?: Modeling Estimated Benefits in Prostate Cancer Screening Simulation of Quality-Adjusted Survival in Chronic Diseases: An Application in Type 2 Diabetes Bayesian Inference for Comorbid Disease Risks Using Marginal Disease Risks and Correlation Information From a Separate Source Can Life Expectancy and QALYs Be Improved by a Framework for Deciding Whether to Apply Clinical Guidelines to Patients With Severe Comorbid Disease? Integrating Health Economics Into the Product Development Cycle: A Case Study of Absorbable Pins for Treating Hallux Valgus

12 Stanford University October Examples of research (last three issues of Medical Decision Making)  Calibrating models Estimating the Unknown Parameters of the Natural History of Metachronous Colorectal Cancer Using Discrete-Event Simulation Bayesian Calibration of a Natural History Model with Application to a Population Model for Colorectal Cancer  Representing Uncertainty in Models A Concise Equation That Captures the Essential Elements of One-Way Sensitivity Analyses in Health Economic Models The Combined Analysis of Uncertainty and Patient Heterogeneity in Medical Decision Models A Framework for Addressing Structural Uncertainty in Decision Models Accounting for Methodological, Structural, and Parameter Uncertainty in Decision-Analytic Models: A Practical Guide

13 Stanford University October Activity: SMDM versus INFORMS DA Cluster  SMDM Abstracts 67 DA or C/E applications 13 DA or C/E methodology 127 utility/ preference/ dec’n psychology  INFORMS DA cluster Abstracts 26 DA applications 72 DA methodology 8 utility/ preference/ dec’n psychology SMDM = Society for Medical Decision Making C/E = Cost-effectiveness

14 Stanford University October Activity (Based on SMDM 2006 participation)  US Harvard School of Public Health Stanford University Tufts-New England Medical Center Boston University Centers for Disease Control and Prevention Case Western Reserve University School of Medicine University of Pittsburgh University of Chicago Dartmouth Medical School Duke University  UK/Europe University of Birmingham University of York University of Sheffield University Medical Centre Utrecht  Canada University of Toronto McMaster University University of British Columbia Univ of Western Ontario University of Ottawa Dalhousie University

15 Stanford University October Academic Preparation SMDM Associate Editors: PhD areas  Psychology (4)  Epi-Biostat (2)  Economics (6) Health Policy (2) Health Econ (2) Health Technology Assessment (2)  MD (4)

16 Stanford University October Academic Preparation: What do these areas have in common? Decision Psychology EconomicsHealth Applied Math/Stat/OR Values and decisions under uncertainty

17 Impacts of the DA field on medical decision making  Decision psychology/ judgment and decision making Thriving. Active research contributions.  Prescriptive decision analysis Basics understood and accepted Nuances not broadly understood Sophisticated tools not used in practice Stanford University October

18 Impacts of prescriptive DA on the medical field  Basics understood, accepted and used Probability, utility Decision trees  TreeAge software quite popular Markov chains Sensitivity analysis Information value Probabilistic sensitivity analysis Bayesian probability and statistics Stanford University October

19 Impacts of prescriptive DA on the medical field Stanford University October

20 Impacts of prescriptive DA on the medical field  Nuances are not broadly appreciated The connection between preference assumptions on the one hand, and expected utility/ expected utility decomposition on the other.  Substitution/Independence (von Neuman & Morganstern)  Utility independence The “preference assumptions  utility decomposition” game is not understood or played. Exceptions:  Pliskin, Shepard, Weinstein  Wakker  Miyamoto Stanford University October

21 Impacts of prescriptive DA on the medical field  Sophisticated tools not employed Influence diagrams Utility decompositions beyond additive  One key exception: HUI (Feeney, Torrence, Furlong) Copulas for constructing joint probability distributions Scoring rules Risk tolerance Stochastic dominance Combining expert judgments Stanford University October

22 Impacts of prescriptive DA: Current research on QALYs Stanford University October

23 QALYs: More for the prescriptive DA field to do?  McHorney 2004 Close to two dozen generic QOL instruments Hundreds of disease-specific instruments In cancer, over 75 different QOL measures exist  Fryback 2004  83 instruments for “General status and quality of life”  6 generic instruments widely adopted 36-Item Short Form Health Survey (SF-36) WHOQOL-BREF Quality of Life Assessment Quality of Well-Being scale (QWB-SA) EuroQol EQ-5D Health Utilities Index Mark 2 and Mark 3 SF-6D, a preference-based measure derived from the SF-36 Stanford University October

24 QALYs: More for the prescriptive DA field to do?  Instrument developers use psychometric techniques classical test theory (CTT) item response theory (IRT)  … to assess reliability, validity, difficulty, stability  These are not tasks for prescriptive DA. Stanford University October

25 QALYs: More for the prescriptive DA field to do? Important issues:  Community preferences vs. preferences of those who have experienced a health state? (see Drummond 2009 )  Different methods for valuing health yield different results Standard gamble Time tradeoff Rating scale Person tradeoff  Consensus that a standardized “reference method” is required for assessing QALYs  Reluctance to endorse “yet another summary measure” (Fryback 2004) loss in ability to compare to previous research findings Measure would not be universally adopted  These are not prescriptive DA issues … Stanford University October

26 Health as a multiattribute concept  This is universally agreed to be the case.  Existing instruments all have multiple dimensions/attributes but not the same ones …  HUI 2/3 both already based on multiattribute utility theory  More for prescriptive DA to do? Maybe not? Reluctance to endorse “yet another summary measure” Anything more complicated than additive or multiplicative might be too much of a “black box” to be accepted by practitioners Stanford University October

27 ISPOR Development Workshop 2007 on “Moving the QALY Forward: Building a Pragmatic Road”  Eight-Item Consensus statement 1. QALYs are a health-based input, but there are other inputs to health decisions. 2. QALYs can be used for population-wide and individual health decisions 3. Little is known about the relationship between health and general well-being 4. Who should provide health value inputs? a) Those who have experienced the health state? b) Representative sample of community members? 5. Distributive/ equity issues need to be addressed. Stanford University October

28 ISPOR Development Workshop 2007 on “Moving the QALY Forward: Building a Pragmatic Road”  Eight-Item Consensus statement 6. A need to better understand why different methods of QALY assessment give different answers 7. Need for better ways to aggregate health impacts over time HYEs theoretically superior but practically infeasible 8. A “Reference Method” is needed for QALYs  Which of these issues can be addressed by prescriptive DA? Distributive/equity issues? Health impacts over time? Stanford University October

29 Stanford University October Summary  Decision psychology continues to make contributions to medical decision analysis Decision psychology Preference/ utility Shared decision making Risk communication  Prescriptive DA forms the basis for medical DA Basic concepts and tools widely used More sophisticated methods not understood and not applied  Health quality (QALYs) Some opportunities for prescriptive DA contributions The biggest stumbling blocks to progress do not appear solvable by prescriptive DA

30 Stanford University October Questions/ comments to follow …


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