Table 1 Intra‐reader and inter‐reader agreements found in the two rounds.

	Mean and range of intra‐reader κ values	Inter‐reader κ values, round one	Inter‐reader kappa values, round two
Doppler signal: yes or no	0.82 (0.58–0.96)	0.66	0.66
Amount of Doppler signal (scale 0–3)	0.72 (0.38–0.93)	0.57	0.53
Case is normal or abnormal	0.80 (0.57–0.96)	0.52	0.55

17 (round one) and 16 (round two) physician sonographers assessed 99 video clips recorded in multiple synovial sites of healthy persons and patients