Table 2. Spearman’s correlations coefficients among US and clinical scores.
| Variables | Correlation in RA with FM (n = 36) | Correlation in RA without FM (n = 36) | Difference (95%CI) ¶ |
|---|---|---|---|
| GS-US7 and DAS28 | 0.36* | 0.39* | -0.03 (-0.44 to 0.38) |
| GS-US7 and SDAI | 0.38* | 0.57* | -0.19 (-0.56 to 0.17) |
| GS-US7 and CDAI | 0.43* | 0.57* | -0.14 (-0.50 to 0.22) |
| PD-US7 and DAS28 | 0.12 | 0.35* | -0.23 (-0.65 to 0.21) |
| PD-US7 and SDAI | 0.01 | 0.38* | -0.37 (-0.78 to 0.08) |
| PD-US7 and CDAI | 0.01 | 0.37* | -0.36 (-0.77 to 0.09) |
* P<0.05
¶ r to z transformation test
DAS28: disease activity score of 28 joints with 4 variables (tender joints count, swollen joint count, patient visual analog scale, erythrocyte sedimentation rate); GS-US7: gray-scale 7-joint ultrasound score; PD-US7: power Doppler 7-joint ultrasound score.