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		1997-98				1996-97
		Under 16	16 to 18	Over 18	Unknown age	Under 16	16 to 18	Over 18	Unknown age
	England Total	260	146	579	9	333	168	572	11
Q01	Norfolk, Suffolk and Cambridgeshire HA	8	6	17	—	9	*	24	—
Q02	Bedfordshire and Hertfordshire HA	*	*	8	—	7	*	13	—
Q03	Essex HA	*	*	16	—	9	6	16	—
Q04	North West London HA	*	6	24	—	6	*	17	—
Q05	North Central London HA	*	*	17	—	*	*	12	—
Q06	North East London HA	*	*	20	—	*	*	19	—
Q07	South East London HA	8	*	32	—	*	8	37	—
Q08	South West London HA	*	*	14	—	*	—	21	—
Q09	Northumberland, Tyne and Wear HA	17	9	15	—	29	6	30	—
Q10	County Durham and Tees Valley HA	8	*	19	—	19	*	11	—
Q11	North and East Yorkshire and Northern Lincolnshire HA	7	*	*	—	*	*	6	—
Q12	West Yorkshire HA	21	10	26	—	18	7	32	—
Q13	Cumbria and Lancashire HA	17	14	22	—	20	7	20	—
Q14	Greater Manchester HA	24	20	53	—	34	23	51	—
Q15	Cheshire and Merseyside HA	14	6	38	—	17	12	47	—
Q16	Thames Valley HA	*	*	18	—	9	*	14	—
Q17	Hampshire and Isle of Wight HA	8	*	15	—	9	*	10	—
Q18	Kent and Medway HA	*	*	18	—	8	*	15	—
Q19	Surrey and Sussex HA	*	*	24	—	11	6	19	—
Q20	Avon, Gloucestershire and Wiltshire HA	7	*	22	—	6	9	14	—
Q21	South West Peninsula HA	9	6	10	—	10	*	6	—
Q22	Dorset and Somerset HA	*	*	10	—	9	*	6	—
Q23	South Yorkshire HA	11	6	*	—	13	11	17	—
Q24	Trent HA	12	12	30	—	23	8	22	—
Q25	Leicestershire, Northamptonshire and Rutland HA	9	*	18	—	*	*	17	—
Q26	Shropshire and Staffordshire HA	12	*	17	—	13	*	8	—
Q27	Birmingham and the Black Country HA	17	—	33	—	17	12	23	—
Q28	Coventry, Warwickshire, Herefordshire and Worcestershire HA	*	*	9	—	8	*	23	—
S	Scotland	—	—	—	—	—	—	—	—
U	England—Not Otherwise Specified	—	—	*	—	—	*	*	—
W	Wales	*	—	*	—	6	*	*	—
X	Foreign (Including Isle of Man and Channel Islands)	—	—	*	—	—	—	—	—
Y	Not Known	*	—	16	9	*	*	13	11
Z	Northern Ireland	—	—	—	—	—	—	—	—
Notes: * The technical term for what has been supplied is finished admission episodes. Assignment of Episodes to Years Years are assigned by the end of the first period of care in a patient’s hospital stay. Finished admission episodes A finished admission episode is the first period of in-patient care under one consultant within one health care provider. Admissions do not represent the number of in-patients, as a person may have more than one admission within the year. Cause code—stab wounds** and gunshot wounds*** The cause code is a supplementary code that indicates the nature of any external cause of injury, poisoning or other adverse effects. Hospital Episode Statistics (HES) has used the following ICD-10 external cause codes when referring to gunshot wounds and knife-related injuries. ** Stab wounds: X99.—Assault by sharp object *** Gunshot wounds: W32.—Handgun discharge W33.—Rifle, shotgun and larger firearm discharge W34.—Discharge from other and unspecified firearms X72.—Intentional self-harm by handgun discharge X73.—Intentional self-harm by rifle, shotgun and larger firearm discharge X74.—Intentional self-harm by other and unspecified firearm discharge X93.—Assault by handgun discharge X94.—Assault by rifle, shotgun and larger firearm discharge X95.—Assault by other and unspecified firearm discharge Y22.—Handgun discharge, undetermined intent Y23.—Rifle, shotgun and larger firearm discharge, undetermined intent Y24.—Other and unspecified firearm discharge, undetermined intent Y35.0 Legal intervention involving firearm discharge Y36.4 War operations involving firearm discharge and other forms of conventional warfare Data Quality HES are compiled from data sent by over 300 NHS trusts and primary care trusts (PCTs) in England. The NHS 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. 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 seen 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 out-patient settings and may no longer be accounted in the HES data. This may account for any reductions in activity over time. Ungrossed Data Figures have not been adjusted for shortfalls in data (i.e. the data are ungrossed). Low Numbers Due to reasons of confidentiality, figures between 1 and 5 have been suppressed and replaced with “*” (an asterisk). PCT and SHA Data Quality PCT and SHA data was 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 is 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 is 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. Source: HES, The NHS Information Centre for health and social care.

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