Table 3

Intraclass correlation coefficients and smallest detectable change for scorings of radiographs and CT and volume measurements on CT

ICC status scoreICC change scoreSDC (SDC%)
0 months6 months12 months0–6 months0–12 months6 months12 months
S/vdH total score0.980.990.990.150.492.9 (2.6)1.8 (1.6)
S/vdH erosion score0.950.940.940.350.171.3 (2.4)1.1 (2.0)
S/vdH narrowing score0.970.980.970.500.761.9 (2.4)1.4 (1.7)
CT erosion score0.970.960.960.950.890.3 (0.5)0.7 (1.2)
CT erosion volume0.990.990.990.890.9319 (1.6)17 (1.5)
  • CT, computed tomography; ICC, intraclass correlation coefficient; SDC, smallest detectable change; SDC%, SDC as a percentage of actually obtained maximum score; S/vdH, Sharp/van der Heijde.