Characteristics of included studies on Australasian Triage System, Canadian Acuity and Triage Scale (CTAS), Emergency Severity Index (ESI) and Manchester Triage System (MTS)
| Author | Year | Country | Target triage systems | Populations | Sample size | Sites (n) | Design |
| Wuerz42 | 2000 | USA | ESI | Adult | 493 | 2 | Prospective |
| Wuerz43 | 2001 | USA | ESI | Adult | 8855 | 2 | Retrospective |
| Wuerz53 | 2001 | USA | ESI | Adult | 202 | 1 | Retrospective |
| Jiménez26 | 2003 | Andorra | CTAS | Adult /paediatric | 32 261 | 1 | Retrospective |
| Eitel15 | 2003 | USA | ESI V.2 | Adult/paediatric | 1042 | 7 | Prospective |
| Bergeron47 | 2004 | Canada | CTAS | Paediatric | 55 | 1 | Prospective |
| Tanabe35 | 2004 | USA | ESI V.3 | NS | 403 | 1 | Retrospective |
| Tanabe36 | 2004 | USA | ESI V.3 | NS | 403 | 1 | Retrospective |
| Gouin18 | 2005 | Canada | CTAS | Paediatric | 537 | 1 | Prospective |
| Baumann11 | 2005 | USA | ESI V.3 | Paediatric | 510 | 1 | Retrospective |
| Dong14 | 2005 | Canada | CTAS | NS | 722 | 1 | Prospective |
| Chi48 | 2006 | Taiwan | ESI, TTS | Adult | 3172 | 1 | Prospective |
| Roukema32 | 2006 | Netherlands | MTS | Paediatric | 1065 | 1 | Retrospective |
| Worster41 | 2006 | Canada | CTAS, ESI V.3 | NS | 486 | 2 | Prospective |
| Baumann12 | 2007 | USA | ESI V.3 | Geriatric | 929 | 1 | Retrospective |
| Dong13 | 2007 | Canada | CTAS | NS | 29 346 | 1 | Prospective |
| Elshove-Bolk17 | 2007 | Norway | ESI | Adult | 1832 | 1 | Prospective |
| van Veen40 | 2008 | Netherlands | MTS | Paediatric | 16 735 | 2 | Prospective |
| van der Wulp39 | 2008 | Netherlands | MTS | NS | 50 | 2 | Prospective |
| Ma10 | 2008 | Canada | CTAS | Paediatric | 1618 | 1 | Retrospective |
| van der Wulp38 | 2009 | Netherlands | ESI, MTS | NS | 37 974/34 258 | 4 | Retrospective |
| Travers37 | 2009 | USA | ESI V.4 | Paediatric | 1000 | 5 | Prospective |
| Olofsson29 | 2009 | Sweden | MTS | Adult/paediatric | 1027 | 7 | Prospective |
| Gravel22 | 2009 | Canada | CTAS | Paediatric | 58 529 | 1 | Retrospective |
| Martins45 | 2009 | Portugal | MTS | Adult | 316 622 | 1 | Retrospective |
| Ng28 | 2010 | Taiwan | CTAS, TTS | Adult | 1851 | 3 | Prospective |
| Platts-Mills31 | 2010 | USA | ESI | Geriatric | 782 | 1 | Retrospective |
| van der Wulp54 | 2010 | 2010 | ESI | Adult | 584 | 1 | Prospective |
| Storm-Versloot34 | 2011 | Netherlands | MTS, ESI, ISS | Adult/paediatric | 900 | 1 | Prospective |
| Grossmann24 | 2011 | Switzerland | ESI V.4 | NS | 2114 | 1 | Prospective |
| Elkum16 | 2011 | Kuwait | CTAS | Adult/paediatric | 1206 | 1 | Retrospective |
| Pinto30 | 2012 | Brazil | MTS | Adult/paediatric | 300 | 1 | Prospective |
| Grossmann25 | 2012 | Switzerland | ESI | Geriatric | 819 | 1 | Prospective |
| Lee27 | 2012 | South Korea | CTAS | Geriatric | 1903 | 1 | Retrospective |
| Gravel21 | 2012 | Canada | CTAS | Paediatric | 1564 | 9 | Prospective |
| Green23 | 2012 | USA | ESI V.4 | Paediatric | 780 | 1 | Retrospective |
| van Veen49 | 2012 | Netherlands | MTS, modified MTS | Paediatric | 11 210 | 2 | Prospective |
| Gravel20 | 2013 | Canada | CTAS | Paediatric | 550 940 | 12 | Retrospective |
| Santos44 | 2013 | Portugal | MTS | NS | 24 721 | 1 | Prospective |
| Al-Hindi51 | 2014 | Saudi Arabia | CTAS | Paediatric | 3014 | 1 | Prospective |
| Graff19 | 2014 | Germany | MTS | NS | 45 469 | 1 | Retrospective |
| Seiger33 | 2014 | Netherlands, UK, Portugal | MTS V.1 and 2 | Paediatric | 60 735 | 4 | Prospective |
| Guedes52 | 2015 | Brazil | MTS | Adult | 577 | 1 | Prospective |
| Hong9 | 2015 | USA | ESI | Adult | 310 | 1 | Prospective |
| Ruipérez46 | 2015 | Spain | ESI | NS | 410 | 1 | Prospective |
| Steiner50 | 2016 | Switzerland | MTS | Adult | 2407 | 1 | Prospective |
ISS, informally structured triage system; NS, not stated; TTS, Taiwan Triage and Acuity Scale.