Arthritis Aurum codelist (as part of Clegg eFrailty Index codelists): 

Generated by GGL and reviewed by CWG
Used CPRD AURUM Medical Browser, Version March 2024


Notes on process: 
- Start with rheumatoid arthritis codelist from JD & HS - https://datacompass.lshtm.ac.uk/id/eprint/3469/
- searched on term for medcodeids that no longer matched records in the Code Browser 
- merged in Julian Matthewman Aurum "translation" of Clegg codelist
- used terms in Clegg codelist to search on "term" and identify additional codes 

Notes on inclusion/exclusion criteria: 
- included historic ("history of") codes as trying to capture frailty as a state rather than incidence of components
- included codes indicating monitoring of arthritis- implies presence
- excluded "family hisotry" codes
- excluded screening codes which dont clearly indicate result of screening 
- excluded codes indicating someone was a "carrier" e.g. "carrier of beta thalassaemia"  or  "alpha thalassaemia trait"
- excluded "factor" even if positive e.g. "rheumatoid factor positive"
- excluded juvenile codes as per 18+ study pop e.g. "juvenile rheumatoid arthritis nos"