Network Meta‐Analysis for Decision-Making Wiley Series in Statistics in Practice
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Network Meta‐Analysis for Decision-Making Wiley Series in Statistics in Practice Advisory Editor, Marian Scott, University of Glasgow, Scotland, UK Founding Editor, Vic Barnett, Nottingham Trent University, UK Statistics in Practice is an important international series of texts that provide detailed coverage of statistical concepts, methods and worked case studies in specific fields of investigation and study. With sound motivation and many worked practical examples, the books show in down‐to‐earth terms how to select and use an appropriate range of statistical techniques in a particular practical field within each title’s special topic area. The books provide statistical support for professionals and research workers across a range of employment fields and research environments. Subject areas covered include medicine and pharmaceutics; industry, finance and commerce; public services; the earth and environmental sciences; and so on. 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E. Ades University of Bristol Bristol, UK Nicky J. Welton University of Bristol Bristol, UK Jeroen P. Jansen Precision Health Economics Oakland, CA Alexander J. Sutton University of Leicester Leicester, UK This edition first published 2018 © 2018 John Wiley & Sons Ltd All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, except as permitted by law. Advice on how to obtain permission to reuse material from this title is available at http://www.wiley.com/go/permissions. The right of Sofia Dias, A. E. Ades, Nicky J. Welton, Jeroen P. Jansen and Alexander J. Sutton to be identified as the authors of this work has been asserted in accordance with law. 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Neither the publisher nor authors shall be liable for any loss of profit or any other commercial damages, including but not limited to special, incidental, consequential, or other damages. Library of Congress Cataloging‐in‐Publication Data Names: Dias, Sofia, 1977- author. Title: Network meta-analysis for decision-making / by Sofia Dias, University of Bristol, Bristol, UK [and four others]. Description: Hoboken, NJ : Wiley, 2018. | Includes bibliographical references and index. | Identifiers: LCCN 2017036441 (print) | LCCN 2017048849 (ebook) | ISBN 9781118951712 (pdf) | ISBN 9781118951729 (epub) | ISBN 9781118647509 (cloth) Subjects: LCSH: Meta-analysis. | Mathematical analysis. Classification: LCC R853.M48 (ebook) | LCC R853.M48 N484 2018 (print) | DDC 610.72/7–dc23 LC record available at https://lccn.loc.gov/2017036441 Cover Design: Wiley Cover Image: © SergeyNivens/Gettyimages Set in 10/12pt Warnock by SPi Global, Pondicherry, India 10 9 8 7 6 5 4 3 2 1 v Contents Preface xiii List of Abbreviations xxi About the Companion Website xxv 1 Introduction to Evidence Synthesis 1 1.1 Introduction 1 1.2 Why Indirect Comparisons and Network Meta‐Analysis? 2 1.3 Some Simple Methods 4 1.4 An Example of a Network Meta‐Analysis 6 1.5 Assumptions Made by Indirect Comparisons and Network Meta‐Analysis 9 1.6 Which Trials to Include in a Network 12 1.6.1 The Need for a Unique Set of Trials 12 1.7 The Definition of Treatments and Outcomes: Network Connectivity 14 1.7.1 Lumping and Splitting 14 1.7.2 Relationships Between Multiple Outcomes 15 1.7.3 How Large Should a Network Be? 15 1.8 Summary 16 1.9 Exercises 16 2 The Core Model 19 2.1 Bayesian Meta‐Analysis 19 2.2 Development of the Core Models 20 2.2.1 Worked Example: Meta‐Analysis of Binomial Data 21 2.2.1.1 Model Specification: Two Treatments 21 2.2.1.2 WinBUGS Implementation: Two Treatments 25 2.2.2 Extension to Indirect Comparisons and Network Meta‐Analysis 32 2.2.2.1 Incorporating Multi‐Arm Trials 35 2.2.3 Worked Example: Network Meta‐Analysis 36 vi Contents 2.2.3.1 WinBUGS Implementation 37 2.3 Technical Issues in Network Meta‐Analysis 50 2.3.1 Choice of Reference Treatment 50 2.3.2 Choice of Prior Distributions 51 2.3.3 Choice of Scale 53 2.3.4 Connected Networks 54 2.4 Advantages of a Bayesian Approach 55 2.5 Summary of Key Points and Further Reading 56 2.6 Exercises 57 3 Model Fit, Model Comparison and Outlier Detection 59 3.1 Introduction 59 3.2 Assessing Model Fit 60 3.2.1 Deviance 60 3.2.2 Residual Deviance 61 3.2.3 Zero Counts* 62 3.2.4 Worked Example: Full Thrombolytic Treatments Network 62 ̅ 3.2.4.1 Posterior Mean Deviance, Dmodel 62 ̅ 3.2.4.2 Posterior Mean Residual Deviance, Dres 64 3.3 Model Comparison 66 3.3.1 Effective Number of Parameters, pD 68 3.3.2 Deviance Information