Fig. 1

Odds ratios for the ROSC. ^aOdds ratios of each prehospital factor for the ROSC. The horizontal bars indicate the 95% CIs. The thick vertical line represents an OR of 1.0, indicating no significant difference. The white circles on the horizontal bars mean a significantly higher OR for the ROSC, the gray circles mean a significantly lower OR, and the black circles mean an OR with no significant difference. ^bThe results were significant based on the 95% CI. ^cVasopressor agents included epinephrine, norepinephrine, phenylephrine, and dopamine. ^dHemostatic agents included tranexamic acid and carbazochrome sodium sulfonate. EMS: emergency medical service, HEMS: helicopter emergency medical service, OR: odds ratio, ROSC: return of spontaneous circulation, CI: confidence interval