Development of a patient-centered core domain set for prospective observational longitudinal outcome studies in rheumatoid arthritis: an OMERACT initiative

To identify patient-centered core domains for prospective longitudinal observational studies (LOS) in rheumatoid arthritis. Our working group held a virtual meeting in November 2020 to review data from a literature review and patient qualitative interviews, and to discuss strategies to move forward on domain identification and selection using the OMERACT 2.1 domain selection process. Important candidate domains and subdomains were identified including in the areas of life impact. Consensus was reached on moving forward with a Delphi process. The meeting provided future directions to identify and select a core set of domains for use in LOS.