• Anniek Brink, Jelmer Alsma, Lodewijk Aam van Attekum, Wichor M Bramer, Robert Zietse, Hester Lingsma, and Stephanie Ce Schuit.
• Department of Internal Medicine, Erasmus MC, Rotterdam, The Netherlands a.brink@erasmusmc.nl.
• Emerg Med J. 2022 Mar 1; 39 (3): 191-198.

BackgroundED crowding has potential detrimental consequences for both patient care and staff. Advancing disposition can reduce crowding. This may be achieved by using prediction models for admission. This systematic review aims to present an overview of prediction models for admission at the ED. Furthermore, we aimed to identify the best prediction tool based on its performance, validation, calibration and clinical usability.MethodsWe included observational studies published in Embase.com, Medline Ovid, Cochrane CENTRAL, Web of Science Core Collection or Google scholar, in which admission models were developed or validated in a general medical population in European EDs including the UK. We used the Critical Appraisal and Data Extraction for Systematic Reviews of Prediction Modelling Studies (CHARMS) checklist to assess quality of model development. Model performance was presented as discrimination and calibration. The search was performed on 11 October 2020.ResultsIn total, 18 539 articles were identified. We included 11 studies, describing 16 different models, comprising the development of 9 models and 12 external validations of 11 models. The risk of bias of the development studies was considered low to medium. Discrimination, as represented by the area under the curve ranged from 0.630 to 0.878. Calibration was assessed in seven models and was strong. The best performing models are the models of Lucke et al and Cameron et al. These models combine clinical applicability, by inclusion of readily available parameters, and appropriate discrimination, calibration and validation.ConclusionNone of the models are yet implemented in EDs. Further research is needed to assess the applicability and implementation of the best performing models in the ED.Systematic Review Registration NumberPROSPERO CRD42017057975.© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY. Published by BMJ.

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