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Table 4 The number of patients who reached the warning zone (WZ) and the rate of in-hospital cardiac arrests (IHCAs)

From: Use of a modified early warning score system to reduce the rate of in-hospital cardiac arrest

  WZ IHCAs Admissions Incidence of IHCAs per 1000 admissions In-hospital deaths
Apr 2011   6 804 7.46 31
May 2011   2 814 2.46 39
Jun 2011   4 855 4.68 27
Jul 2011   4 854 4.68 22
Aug 2011   14 831 16.85 31
Sep 2011   7 792 8.84 41
Oct 2011   5 868 5.76 28
Nov 2011   3 818 3.67 24
Dec 2011   3 820 3.66 28
Jan 2012   3 843 3.56 26
Feb 2012   4 769 5.20 35
Mar 2012   7 868 8.06 36
Apr 2012   3 827 3.63 31
May 2012   1 839 1.19 19
Jun 2012   1 827 1.21 37
Jul 2012   4 965 4.15 34
Aug 2012   5 911 5.49 26
Sep 2012   3 865 3.47 35
Oct 2013 29 2 940 2.13 37
Nov 2013 39 0 994 0.00 34
Dec 2013 44 2 956 2.09 35
Jan 2014 101 6 1016 5.91 61
Feb 2014 62 1 876 1.14 31
Mar 2014 65 1 1005 1.00 31
Apr 2014 48 4 1088 3.68 31
May 2014 50 1 1057 0.95 40
Jun 2014 34 3 1029 2.92 42
Jul 2014 84 4 1125 3.56 36
Aug 2014 28 1 986 1.01 32
Sep 2014 60 2 987 2.03 37
Oct 2014 36 2 965 2.07 29
Nov 2014 33 3 894 3.36 35
Dec 2014 55 3 1033 2.90 31
Jan 2015 72 4 1013 3.95 28
Feb 2015 46 3 950 3.16 34
Mar 2015 34 1 1047 0.96 32
  1. The number of inpatients during each 18-month period before and after the introduction of the modified early warning score system. The monthly mean number of patients who reached the WZ was 51.1