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Demographic Data

Demographic Data. Chrisa Tsiarigli SWL Sector. What is Demographic Data?. Resident population

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Demographic Data

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  1. Demographic Data Chrisa Tsiarigli SWL Sector

  2. What is Demographic Data? • Resident population • This is a count of all people who live in an area and is produced by geographic areas (i.e. regions, boroughs, wards), and by age and gender; this data derives from the Census; data on ethnicity is also available. There are two sources of resident population estimates, ONS and GLA. Both sets of estimates are based on the census data (2001) but projection methods and data sources differ resulting in different estimates. • Registered population • This population data contains only primary care registered patients who may or may not reside in a Local Authority but are considered as the PCT population (as this population is commissioned by the PCT). • Births data • Births data contains all registered births by place of registration and also by place of residence of the mother. • Mortality data • Mortality data contains all registered deaths by place of registration and also place of residence of the deceased. Mortality data is also recorded at primary care but only on GP registered population.

  3. Why do we need Demographic data in Public Health? • To monitor population change over time and its impact on healthcare and Public Health services. • To predict demand for healthcare services. • To draft budgets. • To create key public health statistics (i.e. SMRs, SARs). • To look at ethnicity population mix and ethnicity inequalities in healthcare. • To monitor fertility (births data). • To monitor health inequalities at birth (low birth weight, infant mortality). • To examine causes of death and mortality inequalities (mortality data).

  4. Examples of Demographic data uses in Public Health Source: ONS Source: GLA Births and deaths, England and Wales 1901-2051 SWL population vs. London population

  5. Examples of Demographic data uses in Public Health Source: ONS Source: Population trends Autumn 2008 Estimated & projected population aged 85 +, UK 2008 & 2033 Fertility patterns, 2006(Age-groups at which fertility is highest)

  6. Sources of population data Office for National Statistics - 2001 Census - Mid year estimates - Sub-national population projections Counts, estimates, projections • General Practice • Registered population • Exeter registered resident • Strategic Tracing Service • Local Authority • Electoral Roll • School Roll • Local Planning data

  7. Resident Population Data Sources • Office for National Statistics (ONS) • Census: Data is collected on individuals and on households. The exact data set varies from census to census. Ethnicity data were first collected in 1991, and the ethnic group classifications were changed for the 2001 census. • Mid Year Population Estimates: these estimates are based on the census counts and use mortality and births and migration trends, data to calculate estimated population numbers. Mid year estimates are produced annually. • Greater London Authority (GLA) Population Projections • Constructed using births, deaths, migration assumptions, but constrained by available housing stock, as detailed in the London Housing Capacity Study. Generally considered to be more accurate than ONS for planning purposes. Local authority planners are able to provide detail on proposed developments. Electoral roll can be useful for picking up possible population growth not identified by other sources. • GLA Products • London Local Authority Population projections (latest release 2009-round) • Ethnic group projections (latest release 2009-round) • Ward population projections ( latest 2009-round) • Sources of Ethnicity data: • 2001 Census • GLA ethnic projections (London only) • ONS experimental statistics

  8. Issues with Resident Population Data • Data is not real but estimated unless it comes from the Census. • Census data is not timely and population figures are often under enumerated. • GLA population projections are considered to give a more robust population estimate for London boroughs. • Comparisons with PCTs outside of London: GLA do not provide estimates for PCTs outside of London so you will need to use ONS estimates to make valid comparisons. • Performance monitoring: where a population denominator is used to calculate a rate it is typically the ONS estimate as performance is monitored across the country. • Long-term planning: if you are making plans over a long time period and it is critical that you do not underestimate demand, then you should use the GLA population estimates (high projection).

  9. Registered Population Data Sources • PCSS (Primary Care Support Service) • Exeter Online – registration system • QoF (Quality and Outcomes Framework) • Sources of GP Population Ethnicity data • Exeter for place of birth • GP and special surveys (quality varies) • Hospital and other service data (quality varies)

  10. Issues with Registered Population Data • Contains GP practice only registered patients. • Registered population resides within the PCT and other areas. • Statistical analyses need to take into account the uniqueness of registered population. • Delay in re-registering on re-location (particularly a problem in university towns) • Failure to de-register on leaving the country - still called “embarkation” (particularly a problem where many foreign students or migrant workers) • Results in ‘list inflation’

  11. Population sources: strengths & weaknesses

  12. Births Data Sources & Issues • Sources: • ONS birth registrations:(Name and address of parents, name of newborn, date of birth, place of birth, mothers' place of birth, information on marital status and living arrangements of parents, parents' occupation) • Public Health Birth File PHBF (monthly extracts) • Annual District Birth File (annual extracts) • Vital Statistics (annual summary of births data; it includes summary by wards and birth weight statistics ) • Issues: • ONS data is complete as it is a legal requirement to register a birth. • Long release time (ONS).

  13. Mortality Data Sources & Issues • Sources: • ONS death registrations: (Name and address of deceased, date of birth, occupation, cause of death, place of death, place of birth). • Public Health Mortality File PHBF (monthly extracts). • Annual District Mortality File (annual extracts) • Vital Statistics (annual summary of deaths data; it includes summary by main cause of death and wards, and infant mortality statistics). • Linked ONS-HES mortality data: • It contains only hospital deaths. • Primary Care Mortality database • GP registered population deaths • Issues: • ONS data is complete as it is a legal requirement to register a death. • Long release time (ONS).

  14. Web links to Demographic Data Sources • ONS population, births and deaths data: http://www.neighbourhood.statistics.gov.uk • GLA and ONS data: http://www.lho.org.uk • GLA population data: http://data.london.gov.uk • QoF data: http://www.ic.nhs.uk/qof • Exeter: http://www.connectingforhealth.nhs.uk/nsts • Primary Care Mortality Database: http://www.ic.nhs.uk/statistics-and-data-collections/population-and-geography/primary-care-mortality-database • HES Mortality data: http://www.hesonline.nhs.uk/Ease/servlet/ContentServer?siteID=1937&categoryID=1299

  15. THANK YOU!

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