Table 3.

Validity of randomisation, sample 1 versus sample 2, and performance by SDA among patients with OHCA with cardiac origin

CPC proportions						SDA performance
						d′					AUC-ROC
Subgroup 1 (%)	Subgroup 2 (%)	Subgroup 3 (%)	Subgroup 4 (%)	Subgroup 5 (%)	Subgroup 6 (%)	Public AED use	No defibrillation by EMS	Initial rhythm VF/VT	Age 10–17 years	Eye- witnessed	c-statistics	(95% CI)	p Value
Sample 1
87.5	46.8	30.8	15.7	6.7	0.7	1.43	1.65	1.27	1.42	1.44	0.78	(0.73 to 0.83)	<0.0001
Sample 2
35.3	38.2	40.0	19.8	16.7	0.8	0.69	−0.12	0.97	0.67	1.57	0.88	(0.83 to 0.91)	<0.0001
Total
65.9	42.9	36.4	17.9	9.5	0.7	1.06	0.76	1.12	1.13	1.52	0.83	(0.80 to 0.86)	<0.0001

Cochran-Mantel-Haenszel test: p=0.26.

Subgroup 1: received public AED and did not receive defibrillation by EMS; 2: not received public AED and with VF/VT of initial rhythm and in the age group of 10–17 years; 3: received public AED and received defibrillation by EMS; 4: not received public AED and with non-VF/VT of initial rhythm and witnessed OHCA by a bystander; 5: not received public AED and with VF/VT of initial rhythm and in the age of 5–9 years; 6: not received public AED and with non-VF/VT of initial rhythm and not witnessed OHCA by a bystander.

AED, automated external defibrillator; AUC-ROC, area under the curve in receiver operating curve; CPC, cerebral performance category; EMS, emergency medical service; OHCA, out-of-hospital cardiac arrest; SDA, signal detection analysis.