Table 4

Performance of classification tree, original SAPS II, and recalibrated SAPS II in patients in the independent validation set who fulfill the entry criteria of SAPS II model (n = 1,594)

Classification tree

SAPS II

Recalibrated SAPS II

ROC-AUC ± SD

0.72 ± 0.01

0.75 ± 0.01

0.75 ± 0.01

Brier score

0.19

0.18

0.18

Threshold PPV

0.5

0.64 (348)

0.66 (365)

0.69 (308)

0.7

0.83 (144)

0.76 (218)

0.79 (144)

0.8

0.85 (129)

0.80 (137)

0.84 (87)

PPV, positive predictive value; ROC-AUC, area under the receiver operating characteristic curve; SAPS II, Simplified Acute Physiology Score II; SD, standard deviation.

de Rooij et al. Critical Care 2007 11:R33   doi:10.1186/cc5716