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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)

From: Identification of high-risk subgroups in very elderly intensive care unit patients

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