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Table 4 Mortality figures per Admission view class: crude mortality per admission and predicted mortality per admission.

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

Admission view class Observed number of Crude mortality DHM-2008 predicted
  admissions deaths per admission number of deaths mortality per admission
A(n = 1) 240662 8836 3.7% 9783 4.1%
A(n = 2) 75778 2868 3.8% 2981 3.9%
A(n = 3) 33902 1377 4.1% 1389 4.1%
A(n = 4) 18546 727 3.9% 740 4.0%
A(n = 5,6) 19124 695 3.6% 714 3.7%
A(n = 7-9) 12634 404 3.2% 421 3.3%
A(n = 10-20) 12483 265 2.1% 293 2.2%
A(n > 20) 5437 55 1.0% 57 1.1%
Total 418566 15227 3.6% 16379 3.9%
  1. * The numbers represent totals of the six hospitals. Predicted mortality per admission is in line with observed mortality for all admission view classes. The statistical significance of this is shown in table 5 by means of corresponding standardised mortality ratios and 95% confidence intervals.