Validity and Agreement between the 28-Joint Disease Activity Score Based on C-Reactive Protein and Erythrocyte Sedimentation Rate in Patients with Rheumatoid Arthritis

Figure 1

(a) Bland-Altman plot of disease activity score (DAS28) C-reactive protein (CRP) and DAS28 erythrocyte sedimentation rate (ESR) values at baseline. Difference between DAS28-CRP and DAS28-ERS scores versus mean value of DAS28-CRP and DAS28-ESR at baseline is shown. The mean difference is represented by the central line and the upper and lower bound represent ±1.96SD from the mean. (b) Bland-Altman plot of the change in disease activity score (DAS28) C-reactive protein (CRP) and DAS28 erythrocyte sedimentation rate (ESR) values assessed after one year. Difference between changes in DAS28-CRP and DAS28-ESR scores versus mean value of the changes of DAS28-CRP and DAS28-ESR at baseline is shown. The mean difference is represented by the central line and the upper and lower bound represent ±1.96SD from the mean.

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