Establishment of a prediction model for prehospital return of spontaneous circulation in out-of-hospital patients with cardiac arrest

Table 2 Multivariable logistic regression analysis of prehospital return of spontaneous circulation

Features	Multivariable analysis			Selected factors for model
	OR	95%CI	P value	OR	95%CI	P value
Age	0.98	0.964-0.997	0.018	0.98	0.964-0.996	0.017
Bystander CPR			0.004			0.001
No	1			1
Yes	2.621	1.36-5.051		2.854	1.504-5.414
Initial rhythm			< 0.001			< 0.001
VF/VT	1			1
Asystole/PEA	0.174	0.087-0.349	< 0.001	0.16	0.081-0.318	< 0.001
Ag ECG (slow ventricular escape, bradycardia)	4.539	0.89-23.15	0.069	4.103	0.806-20.895	0.089
CPR duration	0.778	0.75-0.807	< 0.001	0.776	0.749-0.805	< 0.001
ETI			< 0.001			< 0.001
No	1			1
Yes	8.227	4.384-15.439		8.288	4.441-15.465
Lidocaine or amiodarone			0.113
No	1
Yes	2.271	0.823-6.271
Etiology			0.008			0.007
Cardiac	1			1
Trauma	0.156	0.037-0.65	0.011	0.145	0.035-0.601	0.008
Toxicosis or asphyxia	0.171	0.007-4.026	0.275	0.163	0.007-3.907	0.263
Brain and nervous	0.393	0.079-1.95	0.253	0.371	0.075-1.844	0.226
Unknow and other	0.384	0.205-0.721	0.003	0.389	0.208-0.728	0.003

OR: Odds ratio; CI: Confidence interval; VF: Ventricular fibrillation; VT: Ventricular tachycardia; ETI: Endotracheal intubation; PEA: Pulseless electrical activity; Ag ECG: Agonal electrocardiography; CPR: Cardiopulmonary resuscitation.