Fig. 3From: Equivalency between the shock index and subtracting the systolic blood pressure from the heart rate: an observational cohort studyEquivalency tests between SI and SI derived by sSI (HR − SBP). SI: shock index, sSI: simple shock index, HR: heart rate, SBP: systolic blood pressure. Equivalence margin is 0.052. SI derived by sSI was calculated according to the following estimation equation: sSI = 258.55 log SIBack to article page