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The count of finished admission episodes, for emergency admissions where the external cause was 'road traffic accident' (admission methods 21-28), that the former Burntwood, Lichfield and Tamworth Primary Care Trust (PCT) was responsible for, in each year since 1997-98 for which data are available, broken down by age and sex, is shown in the following table.
|Under 18||Over 18|
| Notes: |
1. For reasons of confidentiality numbers between one and five have been suppressed and shown as "*"
2. Finished admission episodes (FAE)
An FAE is the first period of in-patient care under one consultant within one healthcare provider. Admissions do not represent the number of in-patients, as a person may have more than one admission within the year.
3. Cause code
The cause code is a supplementary code that indicates the nature of any external cause of injury, poisoning or other adverse effects.
4. Data quality
HES are compiled from data sent by over 300 national health service trusts and PCTs in England. The Information Centre for health and social care liaises closely with these organisations to encourage submission of complete and valid data and seeks to minimise inaccuracies and the effect of missing and invalid data via HES processes. While this brings about improvement over time, some shortcomings remain.
5. Ungrossed data
Figures have not been adjusted for shortfalls in data (ie the data are ungrossed).
6. PCT and strategic health authority (SHA) data quality
PCT and SHA data were added to historic data-years in the HES database using 2002-03 boundaries, as a one-off exercise in 2004. The quality of the data on PCT of Treatment and SHA of Treatment are poor in 1996-97, 1997-98 and 1998-99, with over a third of all finished episodes having missing values in these years. Data quality of PCT of general practitioner (GP) practice and SHA of GP practice in 1997-98 and 1998-99 are also poor, with a high proportion missing values where practices changed or ceased to exist. There is less change in completeness of the residence-based fields over time, where the majority of unknown values are due to missing postcodes on birth episodes. Users of time series analysis including these years need to be aware of these issues in their interpretation of the data.
7. Assessing growth through time
HES figures are available from 1989-90 onwards. During the years that these records have been collected the NHS there have been ongoing improvements in quality and coverage. These improvements in information submitted by the NHS have been particularly marked in the earlier years and need to be borne in mind when analysing time series.
Changes in NHS practice also need to be borne in mind when analysing time series. For example a number of procedures may now be undertaken in outpatient settings and may no longer be accounted in the HES data. This may account for any reductions in activity over time.
Hospital Episode Statistics (HES), the Information Centre for health and social care