Parameter | TP | FP | TN | FN | SE | SP | PPV | NPV | LR+ | LR− |
Ankylosis | 25 | 1 | 79 | 77 | 24.5% | 98.8% | 96.2% | 50.6% | 19.6 | 0.8 |
Erosion | 53 | 5 | 75 | 49 | 52.0% | 93.8% | 91.4% | 60.5% | 8.3 | 0.5 |
Erosion (dorsal) | 50 | 2 | 78 | 52 | 49.0% | 97.5% | 96.2% | 60.0% | 5.2 | 0.7 |
Sclerosis | 41 | 26 | 54 | 61 | 40.2% | 67.5% | 61.2% | 47.0% | 1.2 | 0.9 |
Sclerosis (dorsal) | 33 | 5 | 75 | 69 | 32.4% | 93.8% | 86.8% | 52.1% | 5.2 | 0.7 |
Ankylosis and/or erosion (any) | 73 | 6 | 74 | 29 | 71.2% | 92.5% | 92.4% | 71.8% | 9.5 | 0.3 |
Ankylosis and/or erosion (dorsal) | 69 | 3 | 77 | 33 | 67.6% | 96.3% | 95.8% | 70% | 18.3 | 0.3 |
Ankylosis and/or sclerosis (any) | 60 | 26 | 54 | 42 | 58.8% | 67.5% | 69.8% | 56.3% | 1.8 | 0.6 |
Ankylosis and/or sclerosis (dorsal) | 54 | 6 | 74 | 48 | 52.9% | 92.5% | 90.0% | 60.7% | 7.1 | 0.5 |
Ankylosis and/or erosion (dorsal) and/or sclerosis (dorsal) | 72 | 8 | 72 | 30 | 70.6% | 90.0% | 90.0% | 70.6% | 7.1 | 0.3 |
FN, false negative; FP, false positive; LR+, positive likelihood ratio; LR−, negative likelihood ratio; NPV, negative predictive value; PPV, positive predictive value; SE, sensitivity; SP, specificity; TN, true negative; TP, true positive.