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Research ArticleArticle

Estimated Cutoff Points for the 28-Joint Disease Activity Score Based on C-reactive Protein in a Longitudinal Register of Early Arthritis

Isabel Castrejón, Ana M. Ortiz, Esther Toledano, Santos Castañeda, Alberto García-Vadillo, Esther Patiño and Isidoro González-Álvaro
The Journal of Rheumatology May 2010, jrheum.091333; DOI: https://doi.org/10.3899/jrheum.091333
Isabel Castrejón
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Ana M. Ortiz
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Esther Toledano
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Santos Castañeda
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Alberto García-Vadillo
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Esther Patiño
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Isidoro González-Álvaro
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Abstract

Objective To estimate the cutoff points for the 28-joint Disease Activity Score (DAS28) calculated using C-reactive protein (CRP) measurements from patients with early arthritis.

Methods We analyzed data from 568 visits of 207 patients enrolled in our prospective longitudinal register of early arthritis. Six rheumatologists evaluated the degree of disease activity at each visit on the basis of the available clinical data, and the final degree of disease activity was established by consensus. DAS28 values were calculated for each visit using CRP or erythrocyte sedimentation rate (ESR). Through a ROC analysis, cutoff points for both indices, as well as for minimal disease activity (MDA), were selected on the basis of the best tradeoff values between sensitivity and specificity.

Results The cutoff values to classify disease activity with the DAS28-CRP were 2.3, 3.8, and 4.9, considering remission at < 2.3, low disease activity 2.3–3.8, moderate disease activity 3.8–4.9, and high disease activity > 4.9. The cutoff value for MDA when calculated with CRP was 2.6. The area under the ROC curves was always greater for DAS28-CRP than for DAS28-ESR, reaching statistical significance for low/moderate activity and for the MDA.

Conclusion Our study confirms that the cutoff points for DAS28-CRP are lower than those described for DAS28-ESR, suggesting that DAS28-CRP may be more accurate to assess disease activity in our population.

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The Journal of Rheumatology
Vol. 50, Issue 3
1 Mar 2023
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Estimated Cutoff Points for the 28-Joint Disease Activity Score Based on C-reactive Protein in a Longitudinal Register of Early Arthritis
Isabel Castrejón, Ana M. Ortiz, Esther Toledano, Santos Castañeda, Alberto García-Vadillo, Esther Patiño, Isidoro González-Álvaro
The Journal of Rheumatology May 2010, jrheum.091333; DOI: 10.3899/jrheum.091333

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Estimated Cutoff Points for the 28-Joint Disease Activity Score Based on C-reactive Protein in a Longitudinal Register of Early Arthritis
Isabel Castrejón, Ana M. Ortiz, Esther Toledano, Santos Castañeda, Alberto García-Vadillo, Esther Patiño, Isidoro González-Álvaro
The Journal of Rheumatology May 2010, jrheum.091333; DOI: 10.3899/jrheum.091333
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