Table 2 Agreement as percent concordance among 10 possible reader pairs for each group of study subjects (kappa values for five readers jointly per cohort)
Cohort | A (n=89) | B (n=88) | |||||
|---|---|---|---|---|---|---|---|
Group | nr-axSpA | AS | NSBP | HC | nr-axSpA | AS | NSBP |
Number of subjects | 20 | 10 | 39 | 20 | 31 | 24 | 33 |
Percent concordance among 10 reader pairsa | |||||||
Total (positive/negative) | |||||||
 BME cart | 88.0 (77.0/11.0) | 88.0 (82.0/6.0) | 78.5 (16.9/61.5) | 85.0 (26.5/58.5) | 78.1 (34.2/43.9) | 78.3 (63.3/15.0) | 86.7 (20.6/66.1) |
 BME lig | 78.0 (31.0/47.0) | 92.0 (76.0/16.0) | 93.8 (0.5/93.3) | 89.0 (0.5/88.5) | 87.7 (5.5/82.3) | 61.7 (19.2/42.5) | 97.0 (0.9/96.1) |
 Fat cart | 69.0 (31.5/37.5) | 64.0 (48.0/16.0) | 74.9 (16.7/58.2) | 74.0 (5.0/69.0) | 76.8 (32.3/44.5) | 70.8 (64.6/6.3) | 76.4 (10.6/65.8) |
 Fat lig | 77.0 (9.5/67.5) | 64.0 (28.0/36.0) | 82.1 (9.0/73.1) | 86.0 (5.0/81.0) | 77.4 (13.9/63.5) | 60.8 (22.9/37.9) | 89.1 (3.6/85.5) |
Kappa value for five readers jointly (95 % CI)b | |||||||
 BME cart | 0.66 (0.56–0.75) | 0.64 (0.53–0.72) | |||||
 BME lig | 0.68 (0.55–-0.79) | 0.37 (0.26–0.45) | |||||
 Fat cart | 0.40 (0.32–0.49) | 0.51 (0.42–0.60) | |||||
 Fat lig | 0.36 (0.25–0.45) | 0.39 (0.25–0.51) | |||||