Table 1 Basic characteristics for the studies included

[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 - 1/10-2009^a

17

Canada

1,536

Observational, prospective cohort study

Emergency call recordings

OHCA registry