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Table 1 Basic characteristics for the studies included

From: Recognition of out-of-hospital cardiac arrest during emergency calls — a systematic review of observational studies

Author, year of publication Study period Study months Country of origin Number of OHCAs analysed Study design Data source for registration of recognition Data source for clinical OHCA
[26] 01-01-2004-31-05-2005 17 Sweden 250 Observational, prospective data collection Data Ambulance records/OHCA registry
[7] 1/1-2004 - 1/9-2004 8 The Nether-lands 285 Observational, prospective. Data Ambulance records
[23] 1/1-2004 - 31/12-2004 12 Northern Ireland 167 Observational, prospective data collection Data Ambulance records/autopsy report
[27] 1/1-2011 - 31/12-2013 36 Switzerland 1,254 Observational, prospective Emergency call recordings Ambulance records
[22] 1/1-2003 - 31/3-2003 3 Australia 738 Observational, retrospective Data OHCA registry
[19] 1/1-2000 - 30/6-2000 6 US (MO) 370 Observational, retrospective Data Ambulance records
[21] 1/1-2007 - 31/12-2007 12 Norway 140 Observational Emergency call recordings OHCA registry
[21] 1/5-2010 - 30/4-2011 12 US (VA) 100 Observational Emergency call recordings OHCA registry
[29] 1/3-2010 - 31/8-2010 6 Finland 164 Observational, prospective cohort study Data Ambulance records
[30] 1/1-1997 - 31/12-2002 72 Finland 373 Observational, retrospective, prospective data collection Data OHCA registry
[6] 1/1-2011 - 31/12-2011 12 US (WA) 476 Observational, retrospective cohort study Emergency call recordings and data N/A
[14] 1/1-2004 - 01/04-2004 3 Taiwan 199 Observational, retrospective Data Ambulance records
[25] 1/1-1996 - 31/12-1996 12 Finland 679 Observational, prospective data collection N/A Ambulance records
[15] 1/1-2011 - 31/12-2011 12 Italy 142 Observational, Retrospective cohort study Data Ambulance records
[28] 15/5-2012 - 31/5-2012 0.5 France 82 Observational, prospective Emergency call recordings Ambulance records
[24] 1/5-2009 - 1/10-2009a 17 Canada 1,536 Observational, prospective cohort study Emergency call recordings OHCA registry
  1. a = In one of the study centres (Ottawa) the study period was 1/1-2008 - 01/02-2009. US: United States, NO: Norway, OHCA: Out-of-Hospital Cardiac Arrest, N/A: Not available, MO: Missouri, VA: Virginia, WA: Washington