Table 3 Intra-observer concordance in wrist and MCP joints
Elementary lesions by US | Overall agreement (%) Presence/absence | Kappa Cohen | 95% CI | P value |
|---|---|---|---|---|
Synovitis | ||||
Wrist | 95 | .87 | .71–1.0 | .001 |
MCP 2 | 84 | .61 | .34–89 | .001 |
MCP 3 | 95 | .84 | .63–1.0 | .001 |
Abnormal power Doppler signal | ||||
Wrist | 95 | .87 | .71–1.0 | .001 |
MCP 2 | 100 | 1.0 | 1.0–1.0 | .001 |
MCP 3 | 100 | 1.0 | 1.0–1.0 | .001 |
Tenosinovitis flexor tendon | ||||
Grayscale | 95 | .88 | .74–1.0 | .001 |
Power Doppler | 100 | 1.0 | 1.0–1.0 | .001 |
Cartilage Damage | ||||
MCP 2 | 94 | .82 | .59–1.0 | .001 |
MCP 3 | 97 | .94 | .84–1.0 | .001 |
Bone erosion | 100 | 1.0 | 1.0–1.0 | .001 |
Synovitis grading | Agreement (%) | Weighted kappa | 95% CI | P value |
Synovitis in all joints by US grayscale | ||||
Grade 0 | 100 | 1.0 | 1.0–1.0 | .001 |
Grade 1 | 73 | .61 | .43–.83 | .004 |
Grade 2 | 83 | .71 | .51–87 | .003 |
Grade 3 | 87 | .84 | .63–.91 | .001 |
Abnormal power Doppler signal | ||||
Grade 0 | 100 | 1.0 | 1.0–10 | .001 |
Grade 1 | 95 | .88 | .71–1.0 | .001 |
Grade 2 | 87 | .83 | .69–.96 | .001 |
Grade 3 | 100 | 1.0 | 1.0–1.0 | .001 |