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6.9 Average length of stay for stroke patients aged 65 years and over, major and large public hospitals, 2012–13

Identifying and definitional attributes

Metadata item type:Help on this termIndicator
Indicator type:Help on this termIndicator
Short name:Help on this termStroke average length of stay in hospital by peer group, 65 years and over, 2012-13
Synonymous names:Help on this termALOS stroke
METeOR identifier:Help on this term601266
Registration status:Help on this termNational Health Performance Authority (retired), Retired 01/07/2016
Australian Commission on Safety and Quality in Health Care, Standard 23/11/2016
Description:Help on this term

Average (mean) length of stay (number of days) for multi-day stay stroke patients aged 65 years and over, major and large public hospitals, 2012-13

Indicator set:Help on this termAustralian Atlas of Healthcare Variation National Health Performance Authority (retired), Retired 01/07/2016
Australian Commission on Safety and Quality in Health Care, Standard 23/11/2016

Collection and usage attributes

Population group age from:Help on this term

65 years and over

Computation description:Help on this term

Presented as the average number of days, by hospital

Only hospitals in the major and large peer groups and which had at least 10 separations were included in the analysis. For more information about these peer groups see http://meteor.aihw.gov.au/content/index.phtml/itemId/584666  

To calculate the average length of stay the key unit that records information about a patient's stay in hospital is called an 'episode of admitted patient care'. This records information about the patient and the care they received in hospital, including:

  • Sex
  • Diagnosis
  • Procedure type
  • Date of admission and
  • Date of separation/discharge.

Exclusions:

The average length of stay indicator relates only to acute patients with a multi-day, or overnight, stay. The following episodes of care are excluded from all reported measures:

  • Same day episodes, i.e. patients admitted and discharged on the same day
  • Episodes for non-acute care
  • Episodes where the patient died Episodes where the patient transferred to another facility within 2 days.

Outlier removal: 

Episodes determined to be extreme long stay outliers were removed. Outlier bounds are derived for each AR-DRG. The method selected for deriving national level outlier bounds uses the inter-quartile ranges as the guide for outlier exclusion. The method of detecting extreme outliers (mEO) is as follows:

mEO = Q+ k*(Q3-Q1)

Where

Q1 equals the 25th percentile value

Q3 equals the 75th percentile value

k equals non-negative values of a constant.

Sensitivity analysis was conducted to identify k and resulted in k=10 being selected.

Computation:Help on this term

Numerator ÷ denominator

Numerator:Help on this term

Number of overnight bed days at major and large public hospitals attributable to stroke in patients aged 65 years and over in 2012-13.

Numerator data elements:Help on this term
Data Element / Data SetEpisode of admitted patient care—length of stay (including leave days), total N[NN]
Data Source
National Hospital Morbidity Database (NHMD)
NMDS / DSS
Admitted patient care NMDS 2012-13
Guide for use

Data source type: Administrative by-product data


Data Element / Data SetEpisode of care—principal diagnosis, code (ICD-10-AM 7th edn) ANN{.N[N]}
Data Source
National Hospital Morbidity Database (NHMD)
NMDS / DSS
Admitted patient care NMDS 2012-13
Data Element / Data SetEpisode of care—additional diagnosis, code (ICD-10-AM 7th edn) ANN{.N[N]}
Data Source
National Hospital Morbidity Database (NHMD)
NMDS / DSS
Admitted patient care NMDS 2012-13
Guide for use

Inclusion codes for Principal diagnosis and sequenced as one of the first two additional diagnoses:

 

ICD-10-AM (7th edn) code Description
I61.0 Intracerebral haemorrhage in hemisphere, subcortical
I61.1 Intracerebral haemorrhage in hemisphere, cortical
I61.2 Intracerebral haemorrhage in hemisphere, unspecified
I61.3 Intracerebral haemorrhage in brain stem
I61.4 Intracerebral haemorrhage in cerebellum
I61.5 Intracerebral haemorrhage, intraventricular
I61.6 Intracerebral haemorrhage, multiple localised
I61.8 Other intracerebral haemorrhage
I61.9 Intracerebral haemorrhage, unspecified
I62.9 Intracranial haemorrhage (non-traumatic), unspecified
I63.0 Cerebral infarction due to thrombosis of precerebral arteries
I63.1 Cerebral infarction due to embolism of precerebral arteries
I63.2 Cerebral infarction due to unspecified occlusion or stenosis of precerebral arteries
I63.3 Cerebral infarction due to thrombosis of cerebral arteries
I63.4 Cerebral infarction due to embolism of cerebral arteries
I63.5 Cerebral infarction due to unspecified occlusion or stenosis of cerebral arteries
I63.6 Cerebral infarction due to cerebral venous thrombosis, nonpyogenic
I63.8 Other cerebral infarction
I63.9 Cerebral infarction, unspecified
I64 Stroke, not specified as haemorrhage or infarction, Cerebrovascular accident NOS

Data source type: Administrative by-product data


Data Element / Data SetPerson—date of birth, DDMMYYYY
Data Source
National Hospital Morbidity Database (NHMD)
NMDS / DSS
Admitted patient care NMDS 2012-13
Guide for use

Data source type: Administrative by-product data

Used to calculate 65 years and over age group.


Denominator:Help on this term

Number of multi-day stays in hospital for people aged 65 years and over attributable to a stroke for a major or large public hospital.

Denominator data elements:Help on this term
Data Element / Data SetEpisode of care—principal diagnosis, code (ICD-10-AM 7th edn) ANN{.N[N]}
NMDS / DSS
Admitted patient care NMDS 2012-13
Data Element / Data SetEpisode of care—additional diagnosis, code (ICD-10-AM 7th edn) ANN{.N[N]}
NMDS / DSS
Admitted patient care NMDS 2012-13
Guide for use

Inclusion codes for Principal diagnosis and sequenced as one of the first two additional diagnoses:

 

ICD-10-AM (7th edn) code Description
I61.0 Intracerebral haemorrhage in hemisphere, subcortical
I61.1 Intracerebral haemorrhage in hemisphere, cortical
I61.2 Intracerebral haemorrhage in hemisphere, unspecified
I61.3 Intracerebral haemorrhage in brain stem
I61.4 Intracerebral haemorrhage in cerebellum
I61.5 Intracerebral haemorrhage, intraventricular
I61.6 Intracerebral haemorrhage, multiple localised
I61.8 Other intracerebral haemorrhage
I61.9 Intracerebral haemorrhage, unspecified
I62.9 Intracranial haemorrhage (non-traumatic), unspecified
I63.0 Cerebral infarction due to thrombosis of precerebral arteries
I63.1 Cerebral infarction due to embolism of precerebral arteries
I63.2 Cerebral infarction due to unspecified occlusion or stenosis of precerebral arteries
I63.3 Cerebral infarction due to thrombosis of cerebral arteries
I63.4 Cerebral infarction due to embolism of cerebral arteries
I63.5 Cerebral infarction due to unspecified occlusion or stenosis of cerebral arteries
I63.6 Cerebral infarction due to cerebral venous thrombosis, nonpyogenic
I63.8 Other cerebral infarction
I63.9 Cerebral infarction, unspecified
I64 Stroke, not specified as haemorrhage or infarction, Cerebrovascular accident NOS

 


Disaggregation:Help on this term

Disaggregation is by:

Disaggregation data elements:Help on this term
Data Element / Data SetEstablishment—organisation identifier (state/territory), NNNNN
Data Source
National Hospital Morbidity Database (NHMD)
NMDS / DSS
Admitted patient care NMDS 2012-13
Guide for use

Data source type: Administrative by-product data

Used for disaggregation by Statistical Areas Level 3.


Data Element / Data SetHospital—hospital peer group, modified code N

Representational attributes

Representation class:Help on this termMean (average)
Data type:Help on this termTime period
Unit of measure:Help on this termTime (e.g. days, hours)
Format:Help on this term

Days, rounded to 1dp

Data source attributes

Data sources:Help on this term
Data SourceNational Hospital Morbidity Database (NHMD)
Frequency
Annual
Quality statement
Data quality statement: National Hospital Morbidity Database 2013–14
Data custodian

Australian Institute of Health and Welfare


Accountability attributes

Reporting requirements:Help on this term

Australian Commission of Safety and Quality in Health Care's Atlas of Healthcare Variation, released November 2015 

Organisation responsible for providing data:Help on this term

Australian Institute of Health and Welfare

Accountability:Help on this term

Australian Commission of Safety and Quality in Health Care

Source and reference attributes

Submitting organisation:Help on this term

National Health Performance Authority

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