Table 6.
Results of logistic regression analysis: adjusted odds ratios (ORs) and 95% confidence intervals (CIs) for the factors related to one-month survival
| 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) | ||
Note: The effects of the 47 prefectures in Japan were controlled for by introducing 46 dummy variables in the analysis.