Some code groups are supplied for all projects - please see the latest version of the data specification template to know which code groups. Codelists and mappings are available for some of these code groups.
Name - Variable name
Anonymised patient ID specific to this dataset - patid
sex - sex1
GP practice ID - study_practice1
Region of England - sha1
Townsend quintile - town_quintile
ethnicity - ethriskid
year of birth - yearofbirth
date left study population - exitdate
reason left study population - exitstuatus
date entered study population - enterdate