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Table 6 Results of logistic regression analysis: adjusted odds ratios (ORs) and 95% confidence intervals (CIs) for the factors related to one-month survival

From: The number of prehospital defibrillation shocks and 1-month survival in patients with out-of-hospital cardiac arrest

Variables Odds ratio 95% CI
Age 0.97 (0.96–0.97)
Sex (0: female, 1: male) 1.18 (1.02–1.37)
Origin of OHCA (0: non cardiac, 1: cardiac) 2.81 (2.26–3.49)
Relationship between bystander and patient (family member), no. (%) 0.77 (0.68–0.88)
Chest compressions (0: no, 1: yes) 1.21 (1.06–1.38)
Rescue breathing (0: no, 1: yes) 1.07 (0.86–1.32)
Emergency life-saving technician in ambulance (0: no, 1: yes) 1.32 (0.87–2.02)
Advanced life support by MD (0: no, 1: yes) 0.80 (0.67–0.95)
Time from call to arrival at scene (min) 0.96 (0.94–0.98)
Time from call to arrival at hospital (min) 0.99 (0.93–0.99)
Use of ALS devices (0: no, 1: laryngeal mask/an adjunct airway/ tracheal tubes) 0.68 (0.59–0.79)
Epinephrine use (yes), no. (%) 0.33 (0.28-0.39)
Time from the first defibrillation to the first ROSC before hospital arrival (0: ≥2 min, 1: ≤1 min) 1.45 (1.18–1.78)
Number of defibrillations (0: ≥3, 1: ≤2) 1.19 (1.03–1.38)
Hosmer–Lemeshow test, χ2 = 11.71 (p = 0.17)
  1. Note: The effects of the 47 prefectures in Japan were controlled for by introducing 46 dummy variables in the analysis.