Fig. 2From: Role of inferior vena cava collapsibility index in the prediction of hypotension associated with general anesthesia: an observational studyDecrease in systolic pressure after the induction of anesthesia measured in the study groups. a absolute decrease in mmHg (mean, standard deviation and range). b relative decrease (percentage) from the baseline (mean, standard deviation and range). For group definitions, see the textBack to article page