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Table 3 Performance of mortality models for acute ischemic stroke

From: Validity of a stroke severity index for administrative claims data research: a retrospective cohort study

  AUC (95 % CI) Hosmer-Lemeshow statistic P IDI (95 % CI) P
Mortality at 3 months
 Base model 0.786 (0.752–0.819) 6.39 0.604 Reference  
 Model with SSI 0.869 (0.844–0.894) 7.07 0.529 0.102 (0.079–0.124) <0.001
 Model with NIHSS 0.860 (0.833–0.887) 7.17 0.519 0.085 (0.064–0.106) <0.001
Mortality at 6 months
 Base model 0.777 (0.748–0.805) 5.13 0.744 Reference  
 Model with SSI 0.844 (0.819–0.869) 5.41 0.713 0.097 (0.077–0.116) <0.001
 Model with NIHSS 0.837 (0.812–0.862) 5.86 0.662 0.082 (0.063–0.100) <0.001
Mortality at 1 year
 Base model 0.767 (0.741–0.793) 4.30 0.829 Reference  
 Model with SSI 0.823 (0.799–0.846) 8.88 0.353 0.101 (0.082–0.121) <0.001
 Model with NIHSS 0.816 (0.793–0.840) 6.42 0.600 0.088 (0.070–0.106) <0.001
  1. AUC area under the receiver operating characteristic curve, CI confidence interval, IDI integrated discrimination improvement, NIHSS National Institutes of Health Stroke Scale, SSI stroke severity index