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Fig. 1 | Critical Care

Fig. 1

From: Determinants of the calibration of SAPS II and SAPS 3 mortality scores in intensive care: a European multicenter study

Fig. 1

Calibration curves for the Simplified Acute Physiology Score (SAPS) II (dark line) and the SAPS 3 (gray line) obtained with a kernel function. The calibration curve represents the relationship between the mortality predicted by the score (x-axis) and the observed mortality (y-axis). The identity line (dashed line) represents a perfect calibration. A calibration curve below the identity line indicates that the score overestimates the mortality. The black and gray circles represent the estimates of the observed mortality in sample, stratified by levels of predicted mortality (by step of 0.01 up to a predicted mortality of 0.20, by step of 0.025 for a predicted mortality from 0.20 to 0.35, and by step of 0.05 for a predicted mortality greater than 0.35). The size of the circles is proportional to the number of patients in categories of predicted mortality

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