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Recorded dementia diagnoses: data quality

Information about the data quality for the statisitical publication recorded dementia diagnoses. 

Accuracy and reliability

Data quality is generally considered to be very good for all GPES extracts.  Between 90 and 100 per cent of practices in England participate each month. 

Data collected is 100 per cent complete, as it is an automated extract GPES extracts data for all patients who have specified codes on their record.

Timeliness and punctuality

Data from the previous month is extracted from GPES on the 1st of the next month.  This extraction period usually lasts around 7 days.  We then aim to publish within the next 7 days.  For example, June 2019 data is extracted between 1 July and 7 July 2019.  Analysis begins on the 8 July 2019 and we aim to publish on 11 July 2019.

Accessibility and clarity

The data are available from our website. The publication includes 1 excel summary, 6 csv files, and an interactive power BI report.

Coherence and comparability

All data included are similar and easily linked on GP Practice Code.

The most recent mapping data is produced each month in order to ensure that data can be compared over a time series. In this release, where a practice closes within the reporting year, it is not assigned geographical mappings following its closure. A small amount of data will therefore be unmapped in the time series files

Data can be compared with data in the annual Quality Outcomes Framework Publication (QOF).

Note in the Summary tables 4, 5 and Annex 1; Dementia 65+ Diagnosis Rate Indicator 12 Month Time Series, by NHS Organisation of responsibility; Recorded Dementia Diagnoses by Age: Care Plans, Assessments and Referrals; Recorded Dementia Diagnoses by Ethnicity ; Recorded Dementia Diagnoses: Prescribing of Anti-Psychotic Medication and Recorded Dementia Diagnoses by 5 year Age bands for 65+ any data prior to July 2022 was calculated using practice to CCG mappings. From July 22 onwards the new practice to ICB mapping is used. Therefore aggregations for data prior to July 2022 may not sum correctly due to the geographical boundary changes documented by the ODS. National level figures are unaffected.

Assessment of user needs and perceptions

Comments and questions can be made through various media including NHS Digital general enquiries by emailing [email protected] or by telephone 0300 303 5678

NHS Digital consult with NHS England and DHSC on a regular basis and make adjustments to the publication based on their feedback. 

Performance, Cost and Respondent Burden

This data is paid for by NHS England on an annual basis.  All costs are covered by them and a new work package is agreed each year.

Confidentiality, Transparency and Security

This publication is subject to a standard NHS Digital risk assessment prior to issue.  Disclosure control is implemented where judged necessary.

Detailed methodology specification documents and other supporting material are available on our website. 

The UK Statistics authority code of practice for statistics is followed regarding security and release of information prior to publication:


Further information

Last edited: 2 February 2023 2:04 pm