Objective: To define and select rheumatoid arthritis (RA)-specific core domain set for Longitudinal Observational Studies (LOS) within the Outcome Measures in Rheumatology (OMERACT) framework.
Methods: A three-round online Delphi exercise, including patient research partners (PRPs) and other community partners in healthcare, was conducted. Domains scored 7-9 (i.e., critically important to include) by ≥ 70 % of participants in both groups were included. Items were consolidated in a subsequent dedicated meeting.
Results: Nineteen domains scored ≥ 70 % consensus in both groups. The focus group refined these into a list of twelve domains.
Conclusion: The achieved consensus will inform the next steps of developing the core domain set for LOS in RA.
Keywords: Core domains; Delphi; OMERACT; Rheumatoid arthritis; longitudinal observational studies.
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