Hover over each region to view some example data

GPRD Practice & Patient Populations

Click here to view a detailed illustration of -

GPRD Practice & Patient Populations

To download the document, simply right click and select 'save target as...'.

Key Facts About GPRD

Acceptable Patients

Patients are labelled as ‘acceptable’ for use in research by a process that identifies and excludes patients with non-contiguous follow up or patients with poor data recording that raises suspicion as to the validity of the patients record. Patient data is checked, for the following issues:

• An empty or invalid first registration date.
• Absence of a record for a year of birth
• A first registration date prior to their birth year
• A transferred out reason with no transferred out date
• A transferred out date with no transferred out reason
• A transferred out date prior to their first registration date
• A transferred out date prior to their current registration date
• A current registration date prior to their first registration date
• A current registration date prior to their birth year
• A gender other than Female/Male/Indeterminate
• An age of greater than 115 at end of follow up
• Recorded health care episodes in years prior to birth year
• Registration status of temporary patients

If any of these conditions are true then the patient is labelled unacceptable, and is not recommended for use in research.

Research Standard Pratices

The overall quality of data in practices is mediated by use of an ‘up to standard’ date, which is deemed as the date at which data in the practice is considered to have continuous high quality data fit for use in research. This is mediated by an analysis on the total data in the practice which is refreshed every time a new collection for a practice is processed into the database. It is based on two central concepts: assurance of continuity in data recording, and avoidance of use of data for which transferred out and dead patients have been removed.

Available Facts