Descriptive Characteristics of the Clinical Practice Research Datalink (CPRD) EMIS database.

Date of ISAC Approval: 
Lay Summary: 
Historically the Clinical Practice Research Datalink (CPRD) database has only included data collected from GP practices using the VISION software system. CPRD has now also begun collecting data from 242 practices which use the EMIS software system. It is imperative that the content of these data is understood before it can be used for research. The aim of this study is to describe the CPRD EMIS data in terms of size, patient follow up time, population variables such as age and gender and clinical parameters such as blood pressure recording. This database profile will then be compared to that of the existing CPRD GOLD database collected from Vision and to the UK population. Further understanding of this database will ensure that it is used appropriately for research studies which are of benefit to public health.
Technical Summary: 
The Clinical Practice Research Datalink (CPRD) has recently begun collecting primary care data from practices using the EMIS software system. The aim of this study is to characterise these data in terms of population, practice and patient characteristics and key clinical parameters. We will use data available in the Patient and other relevant clinical data tables to calculate simple descriptive statistics such as mortality rates. Results will be compared to previously published work characterising the CPRD Vision database and statistics from the 2011 UK census data. This work is intended to be published in a peer reviewed journal to provide a reference point for future studies using the CPRD EMIS data.
Health Outcomes to be Measured: 
Characterisation of EMIS data

Ms Jennifer Campbell - Chief Investigator - CPRD
Mr Daniel Dedman - Researcher - CPRD
Dr Wilhelmine Meeraus - Researcher - GlaxoSmithKline - UK