Outcomes of Basic Versus Advanced Life Support for Out-of-Hospital Medical Emergencies
Authors: Yusuke Tsutsumi, Yasushi Tsujimoto, Yuki Kataoka, Tatsuyoshi Ikenoue
Journal: Annals of Internal Medicine (2016)

Letters5 July 2016Outcomes of Basic Versus Advanced Life Support for Out-of-Hospital Medical EmergenciesYusuke Tsutsumi, MD, Yasushi Tsujimoto, MD, Yuki Kataoka, MD, MPH, and Tatsuyoshi Ikenoue, MD, MPHYusuke Tsutsumi, MDFrom Graduate School of Medicine and Public Health, Kyoto University, Kyoto, Japan.Search for more papers by this author, Yasushi Tsujimoto, MDFrom Graduate School of Medicine and Public Health, Kyoto University, Kyoto, Japan.Search for more papers by this author, Yuki Kataoka, MD, MPHFrom Graduate School of Medicine and Public Health, Kyoto University, Kyoto, Japan.Search for more papers by this author, and Tatsuyoshi Ikenoue, MD, MPHFrom Graduate School of Medicine and Public Health, Kyoto University, Kyoto, Japan.Search for more papers by this authorAuthor, Article, and Disclosure Informationhttps://doi.org/10.7326/L15-0626 SectionsAboutFull TextPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinkedInRedditEmail TO THE EDITOR:We read the article by Sanghavi and colleagues with great interest and appreciate the authors' efforts to conduct comprehensive research (1). However, we have 2 questions about their analysis methods.First, the authors used propensity score–weighting methods. According to a previous study the authors cited (2), if the propensity score for individual i is πi (that is, the probability to receive ALS in this case), the weighting strategy is the inverse of πi for ALS and the inverse of 1 − πi for BLS. This method is well-known as inverse probability of weighting. However, the authors' weighting method strategy ...References1. Sanghavi P, Jena AB, Newhouse JP, Zaslavsky AM. Outcomes of basic versus advanced life support for out-of-hospital medical emergencies. Ann Intern Med. 2015;163:681-90. [PMID: 26457627]. doi:10.7326/M15-0557 LinkGoogle Scholar2. Hirano K, Imbens GW. Estimation of causal effects using propensity score weighting: an application to data on right heart catheterization. Health Serv Outcomes Res Methodol. 2001;2:259-78. doi:10.1023/A:1020371312283 CrossrefGoogle Scholar3. Stock JH, Watson MW. Introduction to Econometrics. 3rd ed. Pearson Education. 2014. Google Scholar Author, Article, and Disclosure InformationAffiliations: From Graduate School of Medicine and Public Health, Kyoto University, Kyoto, Japan.Disclosures: Authors have disclosed no conflicts of interest. Forms can be viewed at www.acponline.org/authors/icmje/ConflictOfInterestForms.do?msNum=L15-0626. PreviousarticleNextarticle Advertisement FiguresReferencesRelatedDetailsSee AlsoOutcomes of Basic Versus Advanced Life Support for Out-of-Hospital Medical Emergencies Prachi Sanghavi , Anupam B. Jena , Joseph P. Newhouse , and Alan M. Zaslavsky Outcomes of Basic Versus Advanced Life Support for Out-of-Hospital Medical Emergencies Stephen B. Soumerai Outcomes of Basic Versus Advanced Life Support for Out-of-Hospital Medical Emergencies Prachi Sanghavi , Anupam B. Jena , Joseph P. Newhouse , and Alan M. Zaslavsky Metrics 5 July 2016Volume 165, Issue 1Page: 69KeywordsConflicts of interestDisclosure ePublished: 5 July 2016 Issue Published: 5 July 2016 Copyright & PermissionsCopyright © 2016 by American College of Physicians. All Rights Reserved.PDF downloadLoading ...