Table 4

 Interobserver reliability and intraobserver reproducibility with regard to radiological signs

Interobserver A BInterobserver A CInterobserver B CIntraobserver AIntraobserver BIntraobserver C
NY, New York criteria for sacroiliitis; Stoke, Stoke criteria for sacroiliitis.
Syndesmophytes and osteophytes (marginal/non-marginal/osteophyte)0.390.420.510.670.760.76
Sacroiliitis (NY) grade 2–40.750.530.550.520.750.66
Sacroiliitis (Stoke) grade 2–40.760.470.480.520.760.40
Sacroiliitis (NY) grade 3–40.800.740.700.840.770.77
Sacroiliitis (Stoke) grade 3–40.830.660.620.840.770.68
Iliac enthesitis0.430.230.200.790.691.0
Disc space narrowing0.530.380.590.640.590.86