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Hospital Performance: Healthcare-associated Staphylococcus aureus bloodstream infections in 2011–12

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Data source

National Staphylococcus aureus Bacteraemia Data Collection

Healthcare-associated S. aureus bloodstream infection data were extracted from the National Staphylococcus aureus Data Collection 2011-2012, provided by the Australian Institute of Health and Welfare (AIHW). The data used in this report is from the period 1 July 2011 to 30 June 2012. Data were provided on 29 November 2012.

According to the AIHW, “while the data are based on the nationally agreed definition of a S. aureus bacteraemia case, there are limitations that affect the comparability of the information”.

For more information on data quality, please go to the following link: http://www.aihw.gov.au/publication-detail/?id=60129542622

Figure 1 shows a flow chart describing the hospitals covered in the report and the inclusion and exclusion criteria. In 2011/12, there were 757 public hospitals identified in the National Public Hospital Establishments database (NPHED). Of those, 705 provided data to the Admitted Patient Care National Minimum Data Set (APC NMDS) that was used for peer grouping.1

While the National S. aureus Data Collection had 697 hospitals listed, 161 of these had no bed days under surveillance and were excluded from analysis. These 161 hospitals accounted for only 4% of all patient bed days in the Admitted Patient Care National Minimum Data Set (APC NMDS).

The remaining 536 hospitals comprised 96% of total bed days in the dataset. Another 184 hospitals were removed as they reported 5,000 or fewer patient bed days under surveillance necessary for reporting rates. The report presents comparable information on the remaining 352 hospitals.

Coverage of monitoring systems

Some hospital monitoring systems do not cover all beds in a hospital. Maternity, paediatrics and psychiatry wards are most often excluded from monitoring. For any hospital, if the patient bed days under surveillance are less than the total bed days, we say coverage is less than 100%.

Of the 352 hospitals included in this report, 336 hospitals have complete (100%) coverage. The lowest coverage rate was 50% and the average coverage rate was greater than 99%.

Incomplete coverage for a hospital may affect its reported rates of healthcare-associated S. aureus bloodstream infection - this should be taken into account when comparing rates.

Admitted Patient Care National Minimum Data Set

The APC NMDS provided the data necessary to determine hospitals peer groups and allocate hospitals to groups.

The APC NMDS 2011/12 was sourced from the Australian Institute of Health and Welfare (AIHW). The dataset was supplied on 26 March 2013.

For more information on the APC NMDS, please see the AIHW’s data quality statement at: http://meteor.aihw.gov.au/content/index.phtml/itemId/466132

1
The NSCCAHS Acute and Post-acute Centre (APAC) has been excluded from the report due to the difficulties in specifying whether cases were healthcare-associated or community-acquired. Justice Health has been excluded as this facility could not be grouped into a comparable peer group.

Hospitals included in the peer group classification system

Figure 1: Hospitals included in the peer group classification system used for reporting S. aureus bloodstream infections

Number of hospitals retained

757

All public hospitals (National Public Hospital Establishment Database, 2011–12)

705

Hospitals in Admitted Patient Care National Minimum Data Set (APC NMDS), 2011–12

701

Hospitals where cases and patient days are not collapsed into larger hospitals

697

Hospitals providing data to National S. aureus Bacteraemia Data Collection, 2011–12

Total S. aureus cases: 1,734
Total patient bed days: 19,349,402
Patient bed days monitored: 18,424,942

536

Hospitals reporting one or more patient bed days monitored

Total S. aureus cases: 1,734
Total patient bed days: 18,564,745
Patient bed days monitored: 18,424,942

352

Hospitals reporting more than 5,000 patient bed days monitored

Total S. aureus cases: 1,725
Total patient bed days: 18,101,545
Patient bed days monitored: 17,988,668

Excluded from peer group allocation

minus

52

Hospitals not providing data to APC NMDS, 2011–12

minus

4

Hospitals where cases and patient days are collapsed into a larger hospital

minus

4

Hospitals not providing data to National S. aureus Bacteraemia Data Collection

minus

161

Hospitals reporting zero patient bed days monitored

Total S. aureus cases: 0
Total patient bed days: 784,657
Patient bed days monitored: 0

minus

184

Hospitals reporting less than or equal to 5,000 patient bed days monitored

Total S. aureus cases: 9
Total patient bed days: 463,200
Patient bed days monitored: 436,274

Hospitals allocated to a peer group for this report

179

Hospitals reporting one or more S. aureus bloodstream infections

Total S. aureus cases: 1,725
Total patient bed days: 15,693,433
Patient bed days monitored: 15,626,760

173

Hospitals reporting zero S. aureus bloodstream infections

Total S. aureus cases: 0
Total patient bed days: 2,408,112
Patient bed days monitored: 2,361,908

Note
Hospitals in the ‘Other’ and ‘Specialist Women’s and Children’s Hospitals’ peer groups are excluded from Figure 1a and 1b of this report.