Web update: Hospitalisations for mental health conditions and intentional self-harm in 2015–16 - Technical Note - Indicator specification

Web update: Hospitalisations for mental health conditions and intentional self-harm in 2015–16

Indicator specification

Age-standardised rates of mental health overnight hospitalisations and bed days for mental health overnight hospitalisations

These measures reflect the number of overnight hospital admissions for mental health condition compared to the population in the patients’ area of residence.

Summary
Name Age-standardised rates of mental health overnight hospitalisations and bed days for mental health overnight hospitalisations
Description The total number of mental health overnight hospitalisations per 10,000 population, age-standardised, 2013–14, 2014–15 and 2015–16
Indicator disaggregation

Rates are reported for the following conditions:

  • anxiety and stress disorders
  • bipolar and mood disorder
  • depressive episodes
  • drug and alcohol use
  • dementia
  • schizophrenia and delusional disorders

The above rates are also reported by specialised and non-specialised care.

Results Web update: Hospitalisations for mental health conditions and international self-harm in 2015–16
Data sources, data items and reporting
Data sources

NHMD 2013–14, 2014–15 and 2015–16

ABS ERP at 30 June 2013, 2014 and 2015

Data items

Original data items:

Age

SA2 code of patient’s residence

Principal diagnosis code

Separation date and separation mode

Admission date and admission mode

Care type

Psychiatric care days

Calculated data items:

Length of stay (LOS - using the separation and admission dates, taking into account any leave days)

Specialised care where psychiatric care days are greater than or equal to 1 day

Indicator description and calculation
Type of measurement Rate per 10,000 population, reported at integer level
Method of adjustment

Direct age standardisation: http://meteor.aihw.gov.au/content/index.phtml/itemId/327276External link, opens in a new window.

The standard population used was the ABS ERP at 30 June 2001.

Denominator Total population at 30 June of 2013, 2014 and 2015.
Numerator

A separation is classified as a mental health hospitalisation if either of the following conditions are true;

  • it had a mental health ICD-10-AM primary diagnosis from the following list:

    • F00–F99 (excluding F52.5, F84.2, F98.5, F98.6);
    • G30, G47 (excluding G47.3 and G47.4)
    • 099.3
    • R44, R45.0, R45.1, R45.4, R48.
    • Z00.4, Z03.2, Z04.6, Z09.3, Z13.3, Z50.2, Z50.3, Z54.3, Z61.9, Z63.1, Z63.8, Z63.9, Z65.8, Z65.9, Z71.4, Z71.5, Z76.0
  • it included any care in a specialised psychiatric unit (psychiatric care days were greater than or equal to 1

Principal diagnosis codes for reported condition groups are:

Schizophrenia and delusional disorders (F20–F29)

  • Anxiety and stress disorders (F40–F48)
  • Bipolar and mood disorders (F30, F31, F33–F39)
  • Depressive episodes (F32)
  • Drug and alcohol use (F10–F19, Z50.2, Z50.3, Z71.4, Z71.5)
  • Dementia (F00–F03, F05.1, G30 or G31 if any of the previous codes are also present in the record)

Exclusions

  • The separation and admission dates are the same (Length of stay equal to 0)
  • Care type includes the following:

    • newborns without qualified days (7.3)
    • people boarding at a facility and not receiving treatment or care (9)
    • deceased patients admitted for organ donation (10).
  • Unknown age.

Adjustments:

  • If any individual patient’s age at separation is recorded as over 116, they are grouped into the unknown age group.

Defined as per the AIHW report ”Admitted patient mental health-related care“: https://mhsa.aihw.gov.au/services/admitted-patient/External link, opens in a new window.

Calculation (Numerator ÷ denominator) × 10,000 (age adjusted)
Geographic assignment
  • National
  • SA2 of residence reported at the following levels:

    • PHN
    • SA3
Area suppression rules

All data for an area is suppressed for publication if the number of rounded separations ranged from 1 to 4.

The age-standardised rates are suppressed for publication if any of the following conditions are met:

  • The total rounded separations ranged from 5 to 19 in the geographic area.
  • The population of an area (denominator) was less than 2,500.
  • The population of an area (denominator) was less than 30 in any of the standard 5-year age groupings used to calculate the rate, then the rate was marked ‘Interpret with caution’ as these rates are considered potentially more volatile than other published rates. For each of these flagged rates, the effect of an increase of one hospitalisation on the rank of the area was examined. If the rank changed so much that the area was on the cusp of changing two deciles, then the rate was suppressed (marked ‘NP’ – Not available for publication).

Age-standardised rates of intentional self-harm hospitalisations and bed days for intentional self-harm hospitalisations

These measures reflect the number of hospital admissions (same-day and overnight) for a condition or injury resulting from intentional self-harm compared to the population in the patients’ area of residence.

Summary
Name Age-standardised rates of intentional self-harm hospitalisations and bed days for intentional self-harm hospitalisations
Description The total number of intentional self-harm hospitalisations per 10,000 population, age-standardised, 2013–14, 2014–15 and 2015–16
Indicator disaggregation Rates are reported for specialised and non-specialised care
Results Web update: Hospitalisations for mental health conditions and international self-harm in 2015–16
Data sources, data items and reporting
Data sources

NHMD 2013–14, 2014–15 and 2015–16

ABS ERP at 30 June 2013, 2014 and 2015

Data items

Original data items:

Age

SA2 code of patient’s residence

Principal diagnosis code

Separation date and separation mode

Admission date and admission mode

Care type

Psychiatric care days

Calculated data items:

Length of stay (LOS - using the separation and admission dates, taking into account any leave days)

Specialised care where psychiatric care days are greater than or equal to 1 day

Indicator description and calculation
Type of measurement Rate per 10,000 population, reported at integer level
Method of adjustment

Direct age standardisation: http://meteor.aihw.gov.au/content/index.phtml/itemId/327276External link, opens in a new window.

The standard population used was the ABS ERP at 30 June 2001.

Denominator Total population at 30 June of 2013, 2014 and 2015.
Numerator

Include same-day and overnight separations where any diagnosis code (1–100) contains an external cause code of X60–X84 or Y87.0.

Exclusions

  • The separation and admission dates are the same (Length of stay equal to 0)
  • Care type includes the following:

    • newborns without qualified days (7.3)
    • people boarding at a facility and not receiving treatment or care (9)
    • deceased patients admitted for organ donation (10).

Adjustments:

  • If any individual patient’s age at separation is recorded as over 116, they are grouped into the unknown age group.
Calculation (Numerator ÷ denominator) × 10,000 (age adjusted)
Geographic assignment
  • National
  • SA2 of residence reported at the following levels:

    • PHN
    • SA3
Area suppression rules

All data for an area is suppressed for publication if the number of rounded separations ranged from 1 to 4.

The age-standardised rates are suppressed for publication if any of the following conditions are met:

  • The total rounded separations ranged from 5 to 19 in the geographic area.
  • The population of an area (denominator) was less than 2,500.
  • The population of an area (denominator) was less than 30 in any of the standard 5-year age groupings used to calculate the rate, then the rate was marked ‘Interpret with caution’ as these rates are considered potentially more volatile than other published rates. For each of these flagged rates, the effect of an increase of one hospitalisation on the rank of the area was examined. If the rank changed so much that the area was on the cusp of changing two deciles, then the rate was suppressed (marked ‘NP’ – Not available for publication).