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Despite prior research indicating that laboratory results may provide early alerts about such patients on their upcoming adverse events, few studies have examined their role as a critical indicator of the stability of a patient\u2019s medical condition over time. We model and analyze the developmental trajectories of patients\u2019 creatinine levels, a key laboratory marker of serious illness, as a potential risk stratification mechanism across many emergency department visits. We apply group-based statistical methodology to electronic health record data of 70,385 patients, with 3\u201315 emergency department visits, to identify and profile these trajectories for the entire population, for males and for females. Results reveal three distinct creatinine-based trajectory groups over time with significantly differing characteristics that may enable targeted interventions for each group. Future research will incorporate additional disease markers to identify longitudinal factors leading to repeated emergency department visits.<\/jats:p>","DOI":"10.1177\/1460458218824751","type":"journal-article","created":{"date-parts":[[2019,1,22]],"date-time":"2019-01-22T16:56:58Z","timestamp":1548176218000},"page":"205-217","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":3,"title":["Exploring trajectories of emergency department visits using a laboratory-based indicator of serious illness"],"prefix":"10.1177","volume":"26","author":[{"given":"Ofir","family":"Ben-Assuli","sequence":"first","affiliation":[{"name":"Ono Academic College, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rema","family":"Padman","sequence":"additional","affiliation":[{"name":"Carnegie Mellon University, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Itamar","family":"Shabtai","sequence":"additional","affiliation":[{"name":"The College of Management Academic Studies, Israel"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2019,1,22]]},"reference":[{"key":"bibr1-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1001\/jama.2011.1926"},{"key":"bibr2-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijmedinf.2015.09.003"},{"key":"bibr3-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1016\/j.jbi.2015.03.004"},{"key":"bibr4-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1007\/s12553-013-0039-6"},{"key":"bibr5-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1177\/1460458215584203"},{"key":"bibr6-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1016\/S0002-8703(99)70417-5"},{"issue":"6","key":"bibr7-1460458218824751","first-page":"e200","volume":"20","author":"Black JT.","year":"2014","journal-title":"Am J Manag Care"},{"key":"bibr8-1460458218824751","volume-title":"Admissions to internal departments 2000\u20132012","author":"Haklai Z","year":"2013"},{"key":"bibr9-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1111\/jep.12246"},{"key":"bibr10-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1161\/CIRCOUTCOMES.110.954693"},{"key":"bibr11-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1097\/MLR.0b013e3181ef60d9"},{"key":"bibr12-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1503\/cmaj.091117"},{"key":"bibr13-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1001\/jama.2011.1515"},{"key":"bibr14-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1016\/j.healun.2012.01.451"},{"key":"bibr15-1460458218824751","doi-asserted-by":"publisher","DOI":"10.4159\/9780674041318"},{"key":"bibr16-1460458218824751","volume-title":"Proceedings of workshop on information systems & technologies (WITS)","author":"Padman R"},{"key":"bibr17-1460458218824751","doi-asserted-by":"publisher","DOI":"10.4135\/9781412986311.n19"},{"key":"bibr18-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1093\/pan\/mpq025"},{"key":"bibr19-1460458218824751","doi-asserted-by":"publisher","DOI":"10.4159\/9780674041318"},{"key":"bibr20-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.clinpsy.121208.131413"},{"key":"bibr21-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1016\/j.dss.2012.10.049"},{"key":"bibr22-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1177\/0049124106292364"},{"key":"bibr23-1460458218824751","doi-asserted-by":"publisher","DOI":"10.1016\/S0002-8703(00)90311-9"}],"container-title":["Health Informatics Journal"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/1460458218824751","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1177\/1460458218824751","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/1460458218824751","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T22:30:32Z","timestamp":1777501832000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/1460458218824751"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,1,22]]},"references-count":23,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2020,3]]}},"alternative-id":["10.1177\/1460458218824751"],"URL":"https:\/\/doi.org\/10.1177\/1460458218824751","relation":{},"ISSN":["1460-4582","1741-2811"],"issn-type":[{"value":"1460-4582","type":"print"},{"value":"1741-2811","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,1,22]]}}}