Table 4 True and false positives, true and false negatives, sensitivities, specificities, positive predictive values (PPV) and negative predictive values (NPV) for in-plane image reading based on a per-rib analysis
Rib | True positives | True negatives | False positives | False negatives | Affected ribs |
1 | 10 | 84 | 13 | 2 | 12 |
2 | 15 | 88 | 6 | 0 | 15 |
3 | 18 | 87 | 4 | 0 | 18 |
4 | 26 | 77 | 6 | 0 | 26 |
5 | 23 | 78 | 8 | 0 | 23 |
6 | 30 | 71 | 7 | 0 | 30 |
7 | 25 | 78 | 5 | 0 | 25 |
8 | 22 | 80 | 5 | 1 | 23 |
9 | 20 | 83 | 5 | 0 | 20 |
10 | 17 | 88 | 2 | 1 | 18 |
11 | 12 | 85 | 10 | 1 | 13 |
12 | 8 | 94 | 6 | 0 | 8 |
All | 226 | 993 | 77 | 5 | 231 |
Sensitivity | Specificity | PPV | NPV | ||
1 | 83.3 % | 86.6 % | 43.5 % | 97.7 % | |
2 | 100 % | 93.6 % | 71.4 % | 100 % | |
3 | 100 % | 95.6 % | 81.8 % | 100 % | |
4 | 100 % | 92.8 % | 81.3 % | 100 % | |
5 | 100 % | 90.7 % | 74.2 % | 100 % | |
6 | 100 % | 91.0 % | 81.1 % | 100 % | |
7 | 100 % | 94.0 % | 83.3 % | 100 % | |
8 | 95.7 % | 94.1 % | 81.5 % | 98.8 % | |
9 | 100 % | 94.3 % | 80.0 % | 100 % | |
10 | 94.4 % | 97.8 % | 89.5 % | 98.9 % | |
11 | 92.3 % | 89.5 % | 54.5 % | 98.8 % | |
12 | 100 % | 94.0 % | 57.1 % | 100 % | |
All | 97.8 % | 92.8 % | 74.6 % | 99.5 % |