{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,11,13]],"date-time":"2023-11-13T23:05:26Z","timestamp":1699916726169},"reference-count":24,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2009,3,24]],"date-time":"2009-03-24T00:00:00Z","timestamp":1237852800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Pharmacoepidemiology and Drug"],"published-print":{"date-parts":[[2009,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Propensity\u2010score matching is increasingly being used to reduce the impact of treatment\u2010selection bias when estimating causal treatment effects using observational data. Matching on the propensity score creates sets of treated and untreated subjects who have a similar distribution of baseline covariates. Propensity\u2010score matching frequently relies upon calipers, such that matched treated and untreated subjects must have propensity scores that lie within a specified caliper distance of each other. We define the \u2018marginally matched\u2019 subject as a subject who would be matched using the specified caliper width, but who would not have been matched had calipers with a narrower width been employed. Using patients hospitalized with an acute myocardial infarction (or heart attack) and with exposure to a statin prescription at discharge, we demonstrate that the inclusion of marginally matched subjects can have both a quantitative and qualitative impact upon the estimated treatment effect. Furthermore, marginally matched treated subjects can differ from marginally matched untreated subjects to a substantially greater degree than the differences between non\u2010marginally matched treated and untreated subjects in the propensity\u2010score matched sample. The concept of the marginally matched subject can be used as a sensitivity analysis to examine the impact of the matching method on the estimates of treatment effectiveness. Copyright \u00a9 2009 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/pds.1733","type":"journal-article","created":{"date-parts":[[2009,3,24]],"date-time":"2009-03-24T10:54:37Z","timestamp":1237892077000},"page":"469-482","source":"Crossref","is-referenced-by-count":4,"title":["The concept of the marginally matched subject in propensity\u2010score matched analyses"],"prefix":"10.1002","volume":"18","author":[{"given":"Peter C.","family":"Austin","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Douglas S.","family":"Lee","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2009,3,24]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1093\/biomet\/70.1.41"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1080\/01621459.1984.10478078"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.1002\/sim.2053"},{"key":"e_1_2_1_5_2","doi-asserted-by":"publisher","DOI":"10.1002\/sim.2328"},{"key":"e_1_2_1_6_2","doi-asserted-by":"publisher","DOI":"10.1002\/sim.3150"},{"key":"e_1_2_1_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jtcvs.2007.07.021"},{"key":"e_1_2_1_8_2","doi-asserted-by":"publisher","DOI":"10.1002\/sim.2580"},{"key":"e_1_2_1_9_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-4757-2443-1"},{"key":"e_1_2_1_10_2","volume-title":"Quality of Cardiac Care in Ontario","author":"Tu JV","year":"2004"},{"key":"e_1_2_1_11_2","doi-asserted-by":"publisher","DOI":"10.1002\/sim.2770"},{"key":"e_1_2_1_12_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1467-985X.2005.00380.x"},{"key":"e_1_2_1_13_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.ahj.2005.06.034"},{"key":"e_1_2_1_14_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jclinepi.2004.04.003"},{"key":"e_1_2_1_15_2","doi-asserted-by":"publisher","DOI":"10.1001\/jama.290.19.2581"},{"key":"e_1_2_1_16_2","doi-asserted-by":"publisher","DOI":"10.1093\/biomet\/asn004"},{"key":"e_1_2_1_17_2","first-page":"417","article-title":"Controlling bias in observational studies: a review","volume":"35","author":"Cochran WG","year":"1973","journal-title":"Sankhya Ser A"},{"key":"e_1_2_1_18_2","doi-asserted-by":"publisher","DOI":"10.2307\/2684560"},{"key":"e_1_2_1_19_2","doi-asserted-by":"publisher","DOI":"10.1002\/sim.2618"},{"key":"e_1_2_1_20_2","doi-asserted-by":"publisher","DOI":"10.1002\/sim.2781"},{"key":"e_1_2_1_21_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0895-4356(00)00321-8"},{"key":"e_1_2_1_22_2","doi-asserted-by":"publisher","DOI":"10.1080\/01621459.1987.10478441"},{"key":"e_1_2_1_23_2","doi-asserted-by":"publisher","DOI":"10.1002\/pds.969"},{"key":"e_1_2_1_24_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jclinepi.2004.10.016"},{"key":"e_1_2_1_25_2","doi-asserted-by":"publisher","DOI":"10.1002\/pds.968"}],"container-title":["Pharmacoepidemiology and Drug Safety"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1002%2Fpds.1733","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/pds.1733","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,11,13]],"date-time":"2023-11-13T16:41:45Z","timestamp":1699893705000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/pds.1733"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2009,3,24]]},"references-count":24,"journal-issue":{"issue":"6","published-print":{"date-parts":[[2009,6]]}},"alternative-id":["10.1002\/pds.1733"],"URL":"https:\/\/doi.org\/10.1002\/pds.1733","archive":["Portico"],"relation":{},"ISSN":["1053-8569","1099-1557"],"issn-type":[{"value":"1053-8569","type":"print"},{"value":"1099-1557","type":"electronic"}],"subject":[],"published":{"date-parts":[[2009,3,24]]}}}