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Table 2 Adjusted odds ratios of prehospital variables for 1-month outcomes in unmatched patients (n = 386,535)

From: Sex-specific differences in survival after out-of-hospital cardiac arrest: a nationwide, population-based observational study

VariablesAdjusted OR (95% CI)
1-month survival1-month CPC 1 or 2
Year
 2014 (vs. 2013)1.04 (0.99–1.09)1.03 (0.96–1.10)
 2015 (vs. 2013)1.10 (1.05–1.15)1.12 (1.05–1.20)
 2016 (vs. 2013)1.15 (1.10–1.21)1.23 (1.15–1.31)
Geographic Japanese regions
 Rural area* (vs. urban area)1.03 (0.99–1.07)1.02 (0.96–1.07)
 Age0.97 (0.97–0.97)0.96 (0.96–0.97)
Men (vs. women)1.07 (1.03–1.11)1.22 (1.16–1.29)
Witnessed arrest (vs. unwitnessed arrest)
 Family member3.96 (3.80–4.13)4.16 (3.91–4.42)
 Nonfamily member4.86 (4.65–5.08)5.49 (5.16–5.85)
Initial shockable rhythm (vs. initial nonshockable rhythm)7.31 (7.03–7.60)9.17 (8.70–9.65)
Presumed cardiac cause (vs. noncardiac causes)0.79 (0.76–0.82)1.37 (1.29–1.46)
Bystander CPR (vs. no bystander CPR)1.16 (1.12–1.19)1.41 (1.34–1.48)
Use of advanced airway management (vs. no use of airway management)0.69 (0.67–0.72)0.42 (0.40–0.44)
Epinephrine administration (vs. no use of epinephrine)0.81 (0.77–0.84)0.40 (0.37–0.43)
Call-to-response time0.91 (0.90–0.91)0.90 (0.89–0.90)
Call-to-hospital arrival time0.99 (0.99–1.00)1.00 (0.99–1.00)
  1. CI, confidence interval; CPC, Cerebral Performance Category; CPR, cardiopulmonary resuscitation; OR, odds ratio
  2. *The rural area is constituted 19 prefectures with population of less than 200 inhabitants per km2
  3. Adjusted odds ratios are reported for 1-year or 1-min increments