Canhão, HelenaRodrigues, Ana MariaGregório, Maria JoãoDias, Sara SimõesMelo Gomes, José AntónioSantos, Maria JoséFaustino, AugustoCosta, José AntónioAllaart, CorneliaGvozdenović, Emiliavan der Heijde, DesiréeMachado, PedroBranco, Jaime C.Fonseca, João EuricoSilva, José António2019-04-222019-04-222018Canhão, H., Rodrigues, A. M., Gregório, M. J., Dias, S. S., Melo Gomes, J. A., Santos, M. J., … & van der Heijde, D. (2018). Common evaluations of disease activity in rheumatoid arthritis reach discordant classifications across different populations. Frontiers in Medicine, 5, 40. doi: 3389/fmed.2018.00040http://hdl.handle.net/10400.8/3929The classification of disease activity states in rheumatoid arthritis (RA) can be achieved through disease activity indices, such as the Disease Activity Score in 28 joints erythrocyte sedimentation rate (DAS28-ESR), the Simplified Disease Activity Index (SDAI), and the Clinical Disease Activity Index (CDAI). Subjective measurements, such as patient reported outcomes have been incorporated into several of these indices alongside more objective assessments, such as increases in the ESR and C-reactive protein. Moreover, while they use similar criteria, different indices weight these criteria to different extents. Therefore, the classifications based on each evaluation may not always be the same. We aim to compare the performance of the three indices and their individual components in two different populations.engRheumatoid arthritisPatient reported outcomesPhysicians’ perspectiveAcute phase reactantsDAS28-ESRMETEORjournal article10.3389/fmed.2018.00040