Fig. 3

The effect of correction by equations on DAS28-ESR. A Relationship between DAS28-ESR, age, and joint findings before and after corrections. Three-dimensional scatter plot with fitted surface are depicted by sex (red, female; blue, male). “Joint” represents 0.56 × √(TJC28) + 0.28 × √(SJC28). B Distributions of DAS28-ESR before and after corrections. Jitter, box, and violin plots are depicted for each disease activity category by sex (red, female; blue, male). Dashed lines are drawn at the value of 2.6 in DAS28-ESR