SpA-TRI concordance between observers, with different feet projections and combinations, κ score (percentage of agreement)
| Projection (n) | Obs 1 v 2 | Obs 1 v 3 | Obs 2 v 3 |
|---|---|---|---|
| AP, anteroposterior; Lt, lateral; Ob, oblique. | |||
| Lateral (90) | 0.50 (62) | 0.42 (57) | 0.56 (70) |
| Oblique (64) | 0.52 (63) | 0.36 (50) | 0.35 (53) |
| Anteroposterior (118) | 0.40 (54) | 0.41 (55) | 0.21 (40) |
| AP + Lt (46) | 0.25 (43) | 0.53 (58) | 0.45 (58) |
| AP + Ob (20) | 0.32 (49) | 0.45 (58) | 0.25 (40) |
| Lt + Ob (20) | 0.72 (79) | 0.33 (50) | 0.66 (63) |
| AP + Lt + Ob (24) | 0.34 (50) | 0.58 (69) | 0.37 (50) |
| Sacroiliac (120) | 0.47 (59) | 0.41 (50) | 0.34 (50) |