Fig. 2

Non-linear associations between low-flow time and survival discharge stratified by the presence of accidental hypothermia. Four low-flow time points (28, 46, 57, and 88 min) were used as the knots in the cubic splines. In the cubic spline analyses, we adjusted for age, sex, location of cardiac arrest, witnessed cardiac arrest, bystander cardiopulmonary resuscitation, and the initial cardiac rhythm at the scene and upon hospital arrival