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Table 1 Characteristics of patients included in the study

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

  Derivation cohort Validation cohort All patients
Total number 270 054 269 331 539 385
Admission-precipitating diagnosis, n (%)
  Acute myocardial infarction 10 421 (3.9) 10 176 (3.8) 20 597 (3.8)
  Congestive heart failure 56 970 (21.1) 56 927 (21.1) 113 897 (21.1)
  Acute cerebrovascular disease 89 983 (33.3) 90 071 (33.4) 180 054 (33.4)
  Gastrointestinal hemorrhage 35 073 (13.0) 34 429 (12.8) 69 502 (12.9)
  Pneumonia 68 387 (25.3) 68 386 (25.4) 136 773 (25.4)
  Septicemia 9220 (3.4) 9342 (3.5) 18 562 (3.4)
Male, n (%) 155 273 (57.5) 154 857 (57.5) 310 130 (57.5)
Age, mean (SD) 74.1 (14.2) 74.1 (14.2) 74.1 (14.2)
Age by category, n (%)
  <60 37 363 (13.8) 37 425 (13.9) 74 788 (13.9)
  60–69 47 235 (17.5) 46 833 (17.4) 94 068 (17.4)
  70–79 73 468 (27.2) 73 509 (27.3) 146 977 (27.2)
  80–89 84 965 (31.5) 84 964 (31.5) 169 929 (31.5)
  ≥90 27 023 (10.0) 26 600 (9.9) 53 623 (9.9)
Charlson comorbidity index, n (%)
  0 162 038 (60.0) 161 597 (60.0) 323 635 (60.0)
  1 34 307 (12.7) 34 015 (12.6) 68 322 (12.7)
  2 52 841 (19.6) 52 688 (19.6) 105 529 (19.6)
  ≥3 20 868 (7.7) 21 031 (7.8) 41 899 (7.8)
In-hospital death, n (%) 25 638 (9.5) 25 449 (9.4) 51 087 (9.5)
Length of stay in days, median (IQR) 15 (9–29) 15 (9–29) 15 (9–29)
  1. IQR – interquartile range
  2. SD – standard deviation