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. 2020 Jul 1;7(3):105–111. doi: 10.5152/eurjrheum.2020.19199

Table 1.

Scatter plots with correlation coefficients showing the relationship between the four RA activity indices.

DAS28-ESR graphic file with name EJR-7-3-105-g04.jpg graphic file with name EJR-7-3-105-g05.jpg graphic file with name EJR-7-3-105-g06.jpg
Pearson’s correlation coefficient DAS28-CRP graphic file with name EJR-7-3-105-g07.jpg graphic file with name EJR-7-3-105-g08.jpg
0.942, p<0.001
Spearman’s Rho
0.952, p<0.001
Kendall’s Tau-b
0.818, p<0.001
Pearson’s correlation coefficient Pearson’s correlation coefficient CDAI graphic file with name EJR-7-3-105-g09.jpg
0.876, p<0.001 0.918, p<0.001
Spearman’s Rho Spearman’s Rho
0.916, p<0.001 0.946, p<0.001
Kendall’s Tau-b Kendall’s Tau-b
0.751, p<0.001 0.809, p<0.001
Pearson’s correlation coefficient Pearson’s correlation coefficient Pearson’s correlation coefficient SDAI
0.896, p<0.001 0.941, p<0.001 0.988, p<0.001
Spearman’s Rho Spearman’s Rho Spearman’s Rho
0.933, p<0.001 0.965, p<0.001 0.986, p<0.001
Kendall’s Tau-b Kendall’s Tau-b Kendall’s Tau-b
0.782, p<0.001 0.851, p<0.001 0.914, p<0.001

The statistics shown are Pearson’s correlation coefficient, Spearman’s Rho, and Kendall’s Tau-b.

CDAI: clinical disease activity index; CRP: C-reactive protein; DAS: disease activity score; ESR: erythrocyte sedimentation rate; SDAI: simple disease activity index.