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