Table 2

Intraclass correlation coefficient (ICC) for measurements of activity

Mean (SD)
MeasurementNT0*T3†T6‡Intraclass correlation coefficient§95% CI
*T0 measurement at start;
†T3 measurement three months after start;
‡T6 measurement six months after start;
§p<0.001;
¶global assessment of disease activity.
Tender joints652.8 (3.2)3.2 (3.3)3.4 (3.8)0.740.61 to 0.83
Swollen joints653.4 (3.1)2.8 (2.9)2.7 (3.0)0.800.70 to 0.87
ESR (mm/1st h)6018.6 (17.4)20.4 (19.2)22.5 (17.6)0.940.91 to 0.96
Global DA¶626.4 (1.4)6.5 (1.6)6.4 (1.7)0.860.79 to 0.91
DAS28563.0 (1.0)3.2 (0.9)3.2 (1.1)0.820.72 to 0.89