Impact of an emergency medical dispatch system on survival from out-of-hospital cardiac arrest: a population-based study

Table 3 Survival at 30 days of patients with out-of-hospital cardiac arrest according to type of dispatch centre, 2005–2013; Northern French Alps Cardiac Arrest Registry (n = 6871)

	Single dispatch centre system		Multiple dispatch centre system
	No Total	No (%) Survivors	No Total	No (%) Survivors	ARR (95 % CI)	Unadjusted OR (95 % CI)^a	p-value	Adjusted OR (95 % CI)^a	p- value
30-day survival (n = 6871)	2257	185 (8.2)	4614	297 (6.4)	+1.8 (0.4–3.1)^b	1.30 (1.07–1.57)	0.007	1.70 (1.30–2.22) ^d	<0.001
30-day survival in propensity score matching analysis (n = 4510)^a	2255	185 (8.2)	2255	140 (6.3)	+1.9 (0.4–3.4)^b	1.32 (1.05–1.66)	0.016	2.00 (1.16–3.43) ^e	0.012

CI confidence interval, ARR absolute risk reduction, OR odds ratio, cath lab catheterization laboratory
^aIndicates OR for single dispatch system compared to multiple dispatch centre system (reference OR = 1.00)
^bIndicates greater survival for single dispatch centre system
^cPropensity score matching analysis based on covariates at the first call (ventricular fibrillation, age, sex, place of cardiac arrest, witness to collapse, first call to fire department telephone number, period of cardiac arrest (2005–2010 and 2011–2013), cath lab first admission (n = 6869). 2255 patients in single dispatch group and 2255 patients in multiple dispatch group
^dUnconditional logistic regression adjusted for covariates at the first call (ventricular fibrillation, age, sex, place of cardiac arrest, witness to collapse, first call to fire department telephone number, period of cardiac arrest [2005–2010 and 2011–2013], cath lab first admission) (n = 6866). Logistic regression = 1672; p <0.001; R2 = 0.48; area under the curve = 0.92; 95 % CI, 0.91–0.94
^eConditional logistic regression based on propensity score matching analysis and adjusted on covariates at the first call (ventricular fibrillation, age, sex, place of cardiac arrest, witness to collapse, period of cardiac arrest [2005–2010 and 2011–2013], cath lab first admission (n = 4510). Logistic regression = 320; p < 0.001; R2 = 0.76; area uder the curve = 0.86; 95 % CI, 0.84–0.89

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