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Table 4 Comparison of two groups of EMS systems grouped by response time reliability achieved or not achieved in 70% of dispatches

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

Provider

Bonn, Göppingen, Gütersloh, Marburg and Münster RTR > 70%

Rendsburg-Eckernförde and Tübingen RTR < 70%

P-values, ORs and 95% CIs

All seven providers

All other centres in the German Resuscitation Registry

Person-years

3,317,400

1,201,052

 

4,518,452

1 Jan 2006 to 31 Dec 2009

All patients (cardiac + noncardiac) (n)

1,897

433

 

2,330

4,624

Time from alert until first vehicle stopped (n)

     

   Patients with time

1,860

347

   

   Patients within 8 minutes

1,530

220

   

   Statistics

82.3%

63.4%

P < 0.01

79.3%

73.6%

   

OR = 2.676

  
   

99% CI = 1.93 to 3.711

  

CPR incidence (1/100,000 inhabitants/year)

57.2%

36.1%

P < 0.01

51.6%

n.d.

   

OR = 1.586

  
   

99% CI = 1.383 to 1.819

  

ROSC (n)

884

205

   

   ROSC (1/100,000 inhabitants/year)

26.6%

17.1%

P < 0.01

24.1%

n.d.

   

OR = 1.561

  
   

99% CI = 1.279 to 1.906

  

Admitted to hospital (n)

811

187

   

   Admitted to hospital (1/100,000 inhabitants/year)

24.4%

15.6%

P < 0.01

22.1%

n.d.

   

OR = 1.57

  
   

99% CI = 1.274 to 1.935

  

ROSC RACA (n)

804

171

   

   ROSC RACA

42.4%

39.5%

P = n.s.

41.9%

n.d.

   

OR = 1.127

  
   

95% CI = 0.911 to 1.395

  

ROSC

46.6%

47.3%

P = n.s.

46.7%

37.9%

   

OR = 0.971

  
   

95% CI = 0.787 to 1.196

  

Admitted to hospital

42.75%

43.19%

P = n.s.

42.83%

32.7%

   

OR = 0.982

  
   

95% CI = 0.878 to 1.116

  

RTR > 70%: ROSC vs RACA ROSC

884/1,897 vs 804/1,897

 

P < 0.01

  
   

OR = 1.186

  
   

99% CI = 1.002 to 1.404

  

RTR < 70%: ROSC vs RACA ROSC

 

205/433 vs 171/433

P < 0.05

  
   

OR = 1.378

  
   

95% CI = 1.052 to 1.804

  
  1. CPR = cardiopulmonary resuscitation; n.d. = not determined; n.s. = not significant; RACA = return of spontaneous circulation after cardiac arrest; ROSC = return of spontaneous circulation; RTR = response time reliability. RTR is the rate of the first vehicle's arriving at the scene within 8 minutes (%). The response time interval was defined as the time from when a call was received in the dispatch centre until the arrival of the first ambulance at the scene. It was calculated using the time stamps of dispatch technology. Odds ratios, confidence intervals and χ2 tests were used for statistical analysis.
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