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Table 3 Mortality figures per Patient view class m: crude mortality per patient and per admission, predicted mortality per admission.

From: Predicting hospital mortality among frequently readmitted patients: HSMR biased by readmission

  Observed number of Crude mortality per DHM-2008 predicted
Patient view class patients admissions deaths patient admission number of deaths mortality per admission
P(m = 1) 164884 164884 8836 5.4% 5.4% 6971 4.2%
P(m = 2) 41876 83752 2868 6.8% 3.4% 3363 4.0%
P(m = 3) 15356 46068 1377 9.0% 3.0% 1899 4.1%
P(m = 4) 7064 28256 727 10.3% 2.6% 1153 4.1%
P(m = 5, 6) 6055 32490 695 11.5% 2.1% 1302 4.0%
P(m = 7-9) 2938 22795 404 13.8% 1.8% 820 3.6%
P(m = 10-20) 2063 26364 265 12.8% 1.0% 714 2.7%
P(m > 20) 426 13957 55 12.9% 0.4% 157 1.1%
Total 240662 418566 15227 6.3% 3.64% 16379 3.9%
  1. * The numbers represent totals of the six hospitals. The crude mortality per patient stabilises around 13% after 10 (re)admissions. The predicted mortality per admission increasingly differs (higher) from observed mortality for increasing patient view classes. The statistical significance of this is shown in table 5 by means of corresponding standardised mortality ratios and 95% confidence intervals.