Table 5 Results of logistic regression analysis: adjusted odds ratios (ORs) and 95% confidence intervals (CIs) for the factors related to the number of defibrillation shocks

Age

(1.01–1.02)

Sex (0: female, 1: male)

(0.72–0.98)

Origin of OHCA (0: non cardiac, 1: cardiac)

(0.41–0.71)

Relationship between bystander and patient (family member), no. (%)

(0.85–1.09)

Chest compressions (0: no, 1: yes)

(0.81–1.06)

Rescue breathing (0: no, 1: yes)

(0.79–1.18)

Emergency life-saving technician in ambulance (0: no, 1: yes)

(0.83–2.03)

Advanced life support by MD (0: no, 1: yes)

(0.58–0.83)

Time from call to arrival at scene (min)

(0.99–1.03)

Time from call to arrival at hospital (min)

(0.99–1.00)

Use of ALS devices (0: no, 1: laryngeal mask/an adjunct airway/ tracheal tubes)

(0.55–0.73)

Epinephrine use (yes), no. (%)

(0.32-0.44)

Time from the first defibrillation to the first ROSC before hospital arrival (0: ≥2 min, 1: ≤1 min)

(2.38–3.99)