Sonographer	Observed agreement	Expected change agreement	Kappa value
1	0.88	0.36	0.82
2	0.90	0.37	0.85
3	0.97	0.37	0.95
4	0.83	0.39	0.72
5	0.93	0.37	0.92

Kappa value=(observed agreement–expected change agreement)/(1–expected change agreement).
*Entheseal thickening measured at 2 mm proximal to the bony contour (abnormality definitions: quadriceps tendon >6.1 mm, proximal and distal patellar ligament >4 mm, Achilles tendon >5.29 mm, plantar aponeurosis >4.4 mm).32