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Table 4 Results of subgroup analyses

From: Procedure-based severity index for inpatients: development and validation using administrative database

  n Mortality rate c-statistic 95 % CI
Admission-precipitating diagnosis
  Acute myocardial infarction 10 176 8.6 % 0.821 0.806 – 0.836
  Congestive heart failure 56 927 9.8 % 0.709 0.702 – 0.716
  Acute cerebrovascular disease 90 071 8.6 % 0.801 0.796 – 0.807
  Gastrointestinal hemorrhage 34 429 4.7 % 0.791 0.780 – 0.801
  Pneumonia 68 386 11.0 % 0.733 0.727 – 0.739
  Septicemia 9342 22.4 % 0.699 0.686 – 0.711
Admission by ambulance
  No 166 979 6.5 % 0.769 0.764 – 0.773
  Yes 102 327 14.3 % 0.744 0.740 – 0.748
Referral from another institution
  No 161 494 9.9 % 0.769 0.766 – 0.773
  Yes 107 808 8.8 % 0.762 0.757 – 0.767
Hospital type
  Non-academic 225 479 9.6 % 0.767 0.764 – 0.770
  Academic 34 162 8.3 % 0.759 0.749 – 0.769
  1. CI – confidence interval