Table 6: Accuracy of x-ray signs; displaying Positive predicted values and Negative predicted values with 95% confidence intervals.
Test |
PPV | NPV | ||||
| Study 55% prevalence | 25% prevalence | 75% prevalence | Study 55% prevalence | 25% prevalence | 75% prevalence | |
| Kager's sign | 78.5 (70.9 - 84.6) | 49.5 (39.8 - 59.3) | 89.8 (84.2 - 93.7) | 76.9 (70.3 - 86.7) | 93.9 (88.4 - 97.0) | 62.2 (50.1 - 73.0) |
| Disruption | 95.7 (87.2 - 98.9) | 85.7 (69.0 - 94.6) | 97.8 (91.7 - 99.6) | 61.0 (53.4 - 68.0) | 85.3 (79.8 - 89.6) | 39.2 (31.7 - 47.3) |
| Loss of parallelism | 96.0 (89.4 - 98.7) | 86.0 (94.1 - 99.7) | 98.5 (94.1 - 99.7) | 72.4 (64.4 - 79.1) | 90.6 (85.6 - 94.1) | 51.7 (42.2 - 61.0) |
| Fusiform | 92.5 (83.8 - 96.1) | 76.7 (61.0 - 87.7) | 97.1 (91.1 - 99.2) | 62.8 (55.1 - 69.9) | 86.2 (80.6 - 90.4) | 40.8 (32.9 - 49.2) |