The impact of response time reliability on CPR incidence and resuscitation success: a benchmark study from the German Resuscitation Registry

Neukamm, Jürgen; Gräsner, Jan-Thorsten; Schewe, Jens-Christian; Breil, Martin; Bahr, Jan; Heister, Ulrich; Wnent, Jan; Bohn, Andreas; Heller, Gilbert; Strickmann, Bernd; Fischer, Hans; Kill, Clemens; Messelken, Martin; Bein, Berthold; Lukas, Roman; Meybohm, Patrick; Scholz, Jens; Fischer, Matthias

doi:10.1186/cc10566

Critical Care

Table 1 Sociodemographic characteristics of the centres

From: The impact of response time reliability on CPR incidence and resuscitation success: a benchmark study from the German Resuscitation Registry

Sociodemographic characteristics	Bonn	Göppingen	Gütersloh	Marburg	Münster	Rendsburg-Eckernförde	Tübingen	P-value	Totals or averages
Served population, (n)	315,000	192,000	319,732	251,800	280,199	272,488	218,692		1,849,911
Service area (km²)	141.0	354.0	864.0	1,262.6	302.9	2,185.9	519.2		5,629.6
Population density (1/km²)	2,234.0	542.4	370.1	199.4	925.0	124.7	421.2		328.6
Time frame	1 Jan 2007 to 31 Dec 2009	1 May 2006 to 31 Dec 2009	1 Nov 2007 to 31 Dec 2009	1 Jan 2008 to 31 Dec 2008	1 Jun 2007 to 31 Dec 2009	1 Jan 2006 31 Dec 2007	1 Jan 2007 to 31 Dec 2009
Person-years	945,000	704,000	692,753	251,800	723,847	544,976	656,076		4,518,452
CPR attempted (n)	533	399	410	164	391	196	237		2,330
CPR incidence (1/year/100,000 inhabitants)	56.4	56.7	59.2	65.1	54.0	36.0	36.1	< 0.001	50.6
Rate of first vehicle's reaching emergency patient within 8 minutes (%)	95.5	70.4	77.9	79.8	90.0	65.6	62.0	< 0.001	80.0
Rate of CPR started within 8 minutes (%)	67.9	60.6	57.6	57.9	64.2	56.0	53.0	< 0.001	60.3
Witnessed (%)	64.2	58.1	58.3	67.7	59.6	65.8	49.4	< 0.001	60.2
Witnessed by bystander (%)	53.8	45.6	47.1	58.5	53.2	59.7	38.4	< 0.001	50.4
CPR performed by bystander (%)	23.3	10.0	20.2	17.1	28.6	24.0	1.3	< 0.001	18.8
Witnessed and CPR performed by EMS (%)	10.3	12.5	11.2	9.1	6.4	6.1	11.0	0.09	9.8
Males (%)	64.4	66.9	66.1	68.3	68.0	71.9	66.7	0.64	66.9
Mean age (years)	66.9	68.9	67.9	65.9	67.4	65.2	65.3		67.1
Median age (years)	70.6	73.0	70.9	69.4	70.2	68.6	70.0		70.2
Age (SD)	17.7	16.1	16.6	16.6	17.0	16.5	19.8		17.2
> 65 years old (%)	65.5	71.4	67.3	57.9	63.4	62.2	66.2	< 0.05
Location of cardiac arrest (%)
Home	70.5	68.2	77.6	71.3	68.0	69.4	69.2	0.05	70.8
Public	17.4	17.3	16.6	15.9	22.0	20.9	18.1	0.37	18.3
Other	12.0	14.5	5.9	12.8	10.0	9.7	12.7	< 0.01	10.9

CPR = cardiopulmonary resuscitation; EMS = emergency medical service. Data are for service areas and populations served by the EMS systems. Unit hours = fully equipped response unit on a response or waiting for a response for 1 hour. P-values were calculated by t-test or χ² test, with significance set at P < 0.05.

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