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. 2024 Apr 19;10(2):e003851. doi: 10.1136/rmdopen-2023-003851

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© Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Classification of patients with seropositive RA and non-RA in the Stop Arthritis Very Early cohort according to the established 2010 ACR/EULAR classification criteria and refined criteria. Application of the refined serological scoring system improved specificity significantly (79% vs 47.4% misclassified patients with non-RA, p<0.0001), whereas sensitivity was not affected (97.3% correctly classified patients with RA). *χ² for proportions (MedCalc Software, Ostend, Belgium). RA, rheumatoid arthritis.