title: Validity and Agreement between the 28-Joint Disease Activity Score Based on C-Reactive Protein and Erythrocyte Sedimentation Rate in Patients with Rheumatoid Arthritis.
abstract: Objective. To validate the agreement between the 28-joint disease activity score based on erythrocyte sedimentation rate (DAS28-ESR) and the 28-joint disease activity score based on C-reactive protein (DAS28-CRP) in a group of Danish patients with rheumatoid arthritis (RA). Methods. Data from 109 Danish RA patients initiating biologic treatment were analysed at baseline and following one year of treatment. Participants were retrospectively enrolled from a previous cohort study and were considered eligible for this project if CRP and ESR were measured at baseline and at the follow-up visit. To assess the extent of agreement between the two DAS28 definitions, the "European League Against Rheumatism" (EULAR) response criteria based on each definition were calculated with cross-classification. Weighted Kappa (κ) coefficients were calculated, and Bland-Altman plots were used to illustrate degree of agreement between DAS28 definitions. Results. The 75 eligible patients were classified as EULAR good, moderate, and nonresponders with good agreement (61/75; 81%) between DAS28-CRP and DAS28-ESR (κ = 0.75 (95% CI: 0.63 to 0.88)). Conclusions. According to our findings, DAS28-CRP and DAS28-ESR are interchangeable when assessing RA patients and the two versions of DAS28 are comparable between studies.
authors: The Parker Institute, Department of Rheumatology, Copenhagen University Hospital, 2000 Frederiksberg, Denmark.
authors: Louise
authors: L
authors: Nielung
authors: The Parker Institute, Department of Rheumatology, Copenhagen University Hospital, 2000 Frederiksberg, Denmark.
authors: Robin
authors: R
authors: Christensen
authors: The Parker Institute, Department of Rheumatology, Copenhagen University Hospital, 2000 Frederiksberg, Denmark ; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen N, Denmark.
authors: Bente
authors: B
authors: Danneskiold-Samsøe
authors: The Parker Institute, Department of Rheumatology, Copenhagen University Hospital, 2000 Frederiksberg, Denmark ; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen N, Denmark.
authors: Henning
authors: H
authors: Bliddal
authors: The Parker Institute, Department of Rheumatology, Copenhagen University Hospital, 2000 Frederiksberg, Denmark.
authors: Christian Cato
authors: CC
authors: Holm
authors: The Parker Institute, Department of Rheumatology, Copenhagen University Hospital, 2000 Frederiksberg, Denmark.
authors: Karen
authors: K
authors: Ellegaard
authors: Department of Rheumatology, Copenhagen University Hospital, 2000 Frederiksberg, Denmark.
authors: Hanne
authors: H
authors: Slott Jensen
authors: The Parker Institute, Department of Rheumatology, Copenhagen University Hospital, 2000 Frederiksberg, Denmark.
authors: Else Marie
authors: EM
authors: Bartels
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