Fig. 3

Predicted and observed mortality based on the 5A scoring system. The median predicted mortality rate is shown for the quartile-based sums of the risk scores in each cohort. The observed mortality rate reflected the proportion of in-hospital mortality. The predictions were well calibrated with the observations. The 5A scoring system provided a simple and rapid prediction of post-accidental hypothermia prognosis. ADL activities of daily living, SBP systolic blood pressure. Arrest was defined as SBP of ≤ 60 mmHg, unmeasurable values, and confirmed arrest