Table 2.

Intraobserver and interobserver reproducibility of synovitis detection by 7 sonographers using OMERACT criteria and B-mode or power Doppler imaging. Synovitis was defined as at least OMERACT grade 1 (ALG1) or OMERACT grade 2 (ALG2).

Reproducibility	Sonographer	B-mode ALG1	B-mode ALG2		Power Doppler ALG1	Power Doppler ALG2
Intraobserver	1	0.75	0.70		0.48	0.25
	2	0.54	0.61		0.50	0.35
	3	0.53	0.70		0.64	0.44
	4	0.37	0.63		0.52	0.77
	5	0.41	0.59		0.52	0.50
	6	0.67	0.62		0.47	0.44
	7	0.67	0.63		0.66	0.63
Interobserver^*	2/ref	0.46	0.61	1/ref	0.37	0.24
	3/ref	0.57	0.68	2/ref	0.26	0.60
	4/ref	0.45	0.66	3/ref	0.55	0.48
	5/ref	0.43	0.55	5/ref	0.47	0.44
	6/ref	0.52	0.58	6/ref	0.39	0.39
	7/ref	0.62	0.65	7/ref	0.49	0.48

↵* Interobserver reproducibility was assessed using the sonographer who had the best intraobserver reproducibility as the reference. This was sonographer #1 for B-mode imaging and sonographer #4 for power Doppler imaging. OMERACT: Outcome Measures in Rheumatology Clinical Trials.