Table 2

Patient outcomes by age groups over the study years

Outcomes by age groups2007200820092010201120122013Change (%)*RR†
(n=678 841)(n=691 464)(n=701 531)(n=723 084)(n=743 639)(n=771 823)(n=803 788)
IHCA incidences: /1000 admissions
 18–34 year0.260.270.210.220.270.310.25−3.8
 35–54 year0.920.810.880.790.680.710.54−41.33.19‡
 55–74 year1.951.721.471.621.481.261.07−45.16.66‡
 ≥75 year4.083.252.732.382.311.911.79−56.111.2‡
 Total1.871.591.391.331.271.110.98−47.6
IHCA survival to discharge: %
 18–34 year53.4931.8241.1842.8642.2248.0865.1221.7
 35–54 year43.8839.6843.8858.5952.6856.7857.4530.91.01
 55–74 year34.3440.0640.6936.2542.6345.9145.2031.60.81§
 ≥75 year18.6220.8024.5126.2824.8430.0729.5737.00.53‡
 Total27.0729.1432.6834.6234.8540.0039.8247.1
IHCA mortality: /1000 admissions
 18–34 year0.120.190.130.120.160.160.09−25.0
 35–54 year0.520.490.490.330.320.310.23−55.82.51
 55–74 year1.281.030.871.030.850.680.59−53.94.85‡
 ≥75 year3.322.582.061.751.741.341.26−62.15.81‡
 Total1.371.130.930.870.830.670.59−56.9
Died within 1 year of discharge after surviving an IHCA: %
 18–34 year4.357.147.146.675.264.000.00−100
 35–54 year6.5612.0016.399.3310.1716.420.00−1003.12‡
 55–74 year24.0022.1430.5121.6721.0524.8115.79−34.27.84‡
 ≥75 year34.0730.4026.4028.4628.8122.7618.52−45.616.2‡
 Total23.5523.1325.1620.7220.9720.9312.50−46.9
Death in low mortality diagnostic-related group: /1000 admissions
 18–34 year0.120.120.060.110.110.120.1525
 35–54 year0.180.360.430.370.180.300.2116.72.71‡
 55–74 year1.521.481.331.371.051.240.99−34.912.1‡
 ≥75 year9.0110.389.118.048.027.566.84−24.169.8‡
 Total2.132.512.292.132.001.971.73−18.8
Hospital mortality: /1000 admissions
 18–34 year0.730.600.670.670.600.680.62−15.1
 35–54 year4.714.704.534.384.274.153.75−25.66.95‡
 55–74 year14.2314.2512.8913.3812.9712.7911.64−18.220.8‡
 ≥75 year39.4939.4536.5634.6734.2833.6429.97−24.148.2‡
 Total15.4815.6614.5514.3414.2014.0612.63−18.4
  • *The percentage of change was calculated as the (value in 2013 – value in 2007)/value in 2007.

  • †RR: relative risk of age groups (adjusted) derived from the adjusted segmented regression model based on cluster robust Poisson regression estimator including covariates year, calendar month, age groups, marital status, country of birth, socio-economic status (based on the Socio-Economic Indexes for Areas (SEIFA) developed by Australian Bureau of Statistics 2011), geographical area of hospitals (urban vs rural), private health insurance status and major hospital peer groups.

  • ‡p<0.001.

  • §p<0.01.

  • ¶p<0.05.

  • IHCA, in-hospital cardiopulmonary arrest.