HealthStats NSW
HealthStats NSW
HealthStats NSW
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The formal process, using registration procedures, under which a person is accepted by a hospital or district health service facility as an inpatient.

Aetiologic fraction

A measure of the amount of disease associated with an exposure within a population. In a situation in which exposure to a given factor is believed to be a cause of a given disease, the population attributable fraction (or population aetiologic fraction) is the proportion of the disease in the total population that can be attributed to exposure to the factor.

Age-adjusted rate

Rate adjusted to take account of differences in age composition when rates for different populations are compared.

Age-specific rate

Rate for a specified age group. Both numerator and denominator refer to the same age group.

Ambulance attendance

A response by the ambulance staff to a particular request for provision of care. Attendances are classified in several categories such as: cardiac, medical, surgical, trauma and routine attendance.

Ambulance services

Services relating to the work of rendering first aid to, and the transport of, sick and injured persons.

Associated cause of death

See UNDERLYING cause of death.


A person who has been in association with an infected person or a contaminated environment that may provide an opportunity to acquire the infection.

Confidence interval

An error margin illustrating the variability in statistics sampled from a population. A 95% confidence interval can be interpreted as a 95% probability that the true value of a variable (such as a rate, mean or proportion) is contained within the interval.

Crude death rate

An estimate of the proportion of a population that dies in a specified period. It is calculated by dividing the number of deaths in a specified period by the number at risk during that period (typically per year).

Day-only admission

A person who is admitted to hospital and leaves on the same calendar day.

Employed persons

All civilians aged 15 years and over who worked for pay or profit or worked without pay in a family business or farm.

Fertility rate

Number of live births in an area during a year, divided by the mid-year female population aged 15-44 in the same area in the same year.

Fetal death

Delivery of a child who did not, at any time after delivery, breathe or show any other evidence of life, such as a heartbeat.

Health-adjusted life expectancy

Life expectancy adjusted for disease and disability. This is the average number of years a person can expect to live in 'full health' by taking into account years lived in less than full health due to disease and/or injury.

Hospital separation or Hospitalisation


Illicit substances

Used for non-medicinal purposes: speed, cocaine, sleeping pills or tranquilisers, marijuana, analgesics, heroin, petrol and other inhalants, hallucinogens, designer drugs, and injecting of any illegal drug.


The rate at which new cases of a disorder occur in the population: that is, the number of new cases in a specified period, divided by the population at risk of the disorder in that period.

Infant death

The death of a child before its first birthday.

Labour force

All persons aged 15 years and over who are employed and unemployed.

Life expectancy

The average number of years of life remaining to a person at a particular age.

Live birth

The birth of a child who, after delivery, breathes or shows any other evidence of life, such as a heartbeat. For calculation of perinatal death rates, includes only infants weighing at least 400 grams at birth or, where birth-weight is unknown, of at least 20 weeks gestation.

Local Government Area

A geographical area under the responsibility of an incorporated local government council.

Local Health Districts

Health administration structures applicable in NSW since January 2011.


Also known as the arithmetic average. It tells where the values for a group (sample) are centred.

Neonatal death

Death within 28 days of birth of any child who, after delivery, breathed or showed any other evidence of life, such as a heartbeat.


Certification in an approved form of a disease listed in Schedule 3 of Notifiable Diseases in the NSW Public Health Act 2010. In HealthStats NSW, notifications concern cases of communicable diseases reported by general practitioners, hospitals and pathology laboratories to the Director General of the NSW Ministry of Health.

Participation rate

The labour force expressed as a percentage of the civilian population aged 15 years and over.

Patient presentation at emergency department

Occurs following the arrival of the patient at the emergency department and is the earliest occasion of the patient being registered clerically or triaged. The patient may be subsequently provided with a service by a treating medical officer or nurse, and a provisional diagnosis is recorded. A 'presentation' is equal to a 'visit' or an 'attendance' at the emergency department.

Perinatal death

A fetal or neonatal death.

Postcodes and Postal Areas (POA)

A postcode is a four digit number used by Australia Post to assist with mail delivery. Australia Post does not currently define geographic boundaries for postcodes.

Postal Areas (POAs) are an Australian Bureau of Statistics (ABS) approximation of postcodes created to enable the release of ABS data on areas that, as closely as possible, approximate postcodes. This enables the comparison of ABS data with other data collected using postcodes.

Potentially avoidable deaths

Deaths occurring before the age 75 years, which could be avoided by clinical or other healthcare interventions.

Potentially preventable hospitalisations

Hospitalisations for certain conditions for which hospitalisation is considered potentially avoidable or preventable if earlier preventive care and disease management was provided ‘upstream’ of the hospitalisation. Usually delivered through primary health care.

Primary Health Network (PHN)

A regional network governed by a Board and consisting of general practitioner-led Clinical Councils and Community Advisory Committees which report to the Board on issues to ensure services across the primary, community and specialist sectors in the region work together. Geographical boundaries of Primary Health Networks (PHNs) are formalised by the Australian Government Department of Health. There are nine Primary Health Networks in NSW. Primary Health Networks replace Medicare Locals.


The number of people with a disease at a given time (point prevalence) or in a specified period (period prevalence), divided by the number of people at risk from that disease.

Principal diagnosis

The first ICD-9 or ICD-10 coding variable reported on the hospital separation form. It means the final diagnosis that best accounts for inpatient care.

Rate ratio

The ratio of two rates: for example, the rate of disease in one population group divided by the rate in another population group.

Secure Analytics for Population Health Research and Intelligence (SAPHaRI)

Data warehouse and analysis tool based on SAS. It is managed by the Centre for Epidemiology and Evidence, NSW Ministry of Health, and employs sophisticated business intelligence technology to enable analysis of key health datasets. SAPHaRI replaced HOIST (Health Outcomes Information Statistical Toolkit) in 2012.

Scheduled medical condition

Medical conditions to be notified under the provisions of the NSW Public Health Act 2010.


The formal process whereby an inpatient leaves a hospital or other district health service facility after completing an episode of care (e.g. discharge to home, discharge to another hospital or nursing home, or death).

Standard deviation

Measures the scatter in a group of observations. While the mean tells where the values for a group (sample) are centred, the standard deviation is a summary of how widely distributed the values are around the centre. Standard deviation describes how widely individuals within the survey sample differ from the sample mean. It may be unaffected by the increased sample size.

Standard error (of the mean)

An estimate of how closely a sample mean is likely to be to the true mean (i.e. the mean of the population from which the sample was drawn). In other words, it is the standard deviation of an estimate of the mean. It is used to calculate confidence intervals. The larger the standard error, the less confident we are that the estimate from the sample is close to the true value. The bigger the sample (that is the closer the sample is to the total population) the smaller the standard error because the estimate of the population mean improves.

Standardised rate


Underlying cause of death

The primary disease or injury causing the death. It is listed on a death certificate together with other diseases or injuries, which are classified as associated causes. These are all other conditions, diseases or injuries that were considered to have contributed to the death.


Persons aged 15 years and over who were not employed and who were actively seeking work, or waiting to be called back to a job from which they had been stood down.

Unemployment rate

The number of unemployed expressed as a percentage of the labour force (i.e. employed and unemployed).

ABS Australian Bureau of Statistics

ACAM Australian Centre for Asthma Monitoring

ACI Agency for Clinical Innovation

ACIR Australian Childhood Immunisation Register

ACR Australian Coordinating Registry

ADHD Attention deficit hyperactivity disorder

AGPS Australian Government Publishing Service

AHR Airway hyperresponsiveness

AHS Australian Bureau of Statistics Australian Health Survey

AHTAC Australian Health Technology Advisory Committee

AI Avian influenza

AIDS Acquired Immunodeficiency Syndrome

AIHW Australian Institute of Health and Welfare

APDC NSW Admitted Patient Data Collection

ARIA Accessibility/Remoteness Index for Australia Plus

ARMCANZ Agriculture and Resource Management Council of Australia and New Zealand

ASGS Australian Statistical Geography Standard

ASHR Australian Study of Health and Relationships

BFv Barmah Forest virus

BMI Body mass index

BOD Burden of disease

BSP Back-scattering coefficient for particles

CAPI Computer-Assisted Personal Interviewing

CATI Computer-Assisted Telephone Interviewing

CABG Coronary artery bypass graft

CAPED NSW Combined Admitted Patient Epidemiology Data

CEE Centre for Epidemiology and Evidence

CHeReL Centre for Health Record Linkage

CI Confidence interval

COAG Council of Australian Governments

CD Census Collection District

COB Country of birth

COD Cause of death

COPD Chronic obstructive pulmonary disease

DALY Disability-adjusted life years

dmft The number of deciduous (infant) teeth which are decayed, missing or have been filled due to caries (that is, tooth decay)

DMFT The number of permanent (adult) teeth which are decayed, missing or have been filled due to caries (that is, tooth decay)

DPE Department of Planning and Environment

DPI Department of Primary Industries

DTP Diphtheria-tetanus-pertussis combined vaccine (also called triple antigen vaccine)

ED Emergency department

EDDC Emergency Department Data Collection

ERA Enhanced reporting of Aboriginality

ERP Estimated resident population

ESRD End-stage renal disease

EV71 Human enterovirus 71

F Female

HALE Health-adjusted life expectancy

HDI Human Development Index

HeV Hendra virus

HFM Hand-foot-and-mouth disease

Hib Haemophilus influenzae type b

HIE Health Information Exchange

HIV Human immunodeficiency virus

HOIST Health Outcomes Information Statistical Toolkit

HPV Human Papilloma Virus

HSP HIV Support Program

ICD-9 International Statistical Classification of Diseases and Related Health Problems, 9th revision

ICD-9-CM International Classification of Diseases, 9th revision, Clinical Modification

ICD-10 International Statistical Classification of Diseases and Related Health Problems, 10th revision

ICD-10-AM International Statistical Classification of Diseases and Related Health Problems, 10th revision, Australian Modification

ICD-O-2 International Classification of Diseases for Oncology, second revision

ICD-O-3 International Classification of Diseases for Oncology, third revision

IRMRC NSW Injury Risk Management Research Centre

IRSD Index of Relative Socio-Economic Disadvantage (a SEIFA index)

LGA Local Government Area

LHD Local Health District

LL 95% CI Lower limit of 95% confidence interval for rate

M Male

microg/dL Micrograms per decilitre

mg/L Milligrams per litre

MMR Measles-mumps-rubella combined vaccine

NAC National Asthma Campaign

NATSEM National Centre for Social and Economic Modelling

NCIMS Notifiable Conditions Information Management System

NDSS National Diabetes Service Scheme

NHS Australian Bureau of Statistics National Health Survey

NEPC National Environment Protection Council

NHMRC National Health and Medical Research Council

No. Number

NO2 Nitrogen dioxide

NSW New South Wales

NSWPHS New South Wales Population Health Survey

OECD Organisation for Economic Cooperation and Development

PBS Pharmaceutical Benefits Scheme

PCTA Percutaneous transluminal angioplasty

PDC NSW Perinatal Data Collection

PHREDSS Public Health Rapid, Emergency, Disease and Syndromic Surveillance

PHU Public Health Unit

PHN Primary Health Network

PM10 Particulate matter <10 microns in diameter

PM2.5 Particulate matter <2.5 microns in diameter

PPH Potentially preventable hospitalisations

ppm parts per million

RBDM Registry of Births, Deaths and Marriages

RRV Ross River virus

SA Level 1 to 4 (SA1, SA2, SA3 and SA4) Australian Bureau of Statistics Statistical Area

SAPHaRI Secure Analytics for Population Health Research and Intelligence

SEIFA Australian Bureau of Statistics Socio-Economic Indexes for Areas

SES Socioeconomic status

SIDS Sudden Infant Death Syndrome

SLA Statistical Local Area

SNOMED-CT Systematized Nomenclature of Medicine – Clinical Terms

STIs Sexually transmissible infections

Type 1 diabetes Insulin-dependent diabetes mellitus

Type 2 diabetes Non-insulin-dependent diabetes mellitus

UL 95% CI Upper limit of 95% confidence interval for rate

URF Unit Record File

UVR Ultraviolet radiation

WHO World Health Organization

YLD Years of healthy life lost due to disability

YLL Years of life lost