Table 2.
Reliability parameters of the screening questionnaires.
| Parameter | Axial Q versus clinical D | Per. Q versus clinical D | US versus clinical D |
|---|---|---|---|
| Sensitivity | 87.5% (67.6–97.3) | 82.8% (64.2–94.2) | 50.5% (36.4–71.9) |
| Specificity | 89.8% (81.5–92.2) | 87.4% (79–93.3) | 64.9 (53.2–75.4) |
| Positive LR | 8.6 (4.5–16.2) | 6.6 (3.8–11.4) | 1.6 (1.1–2.4) |
| Negative LR | 0.14 (0.05–0.4) | 0.2 (0.09–0.4) | 0.7 (0.5–1) |
| PPV | 70% (50.6–85.3) | 66.7% (49–81.4) | 40% (25.7–55.7) |
| NPV | 96.3% (89.7–99.2) | 94.3% (87.2–98.1) | 76.9% (64.8–88.5) |
LR: likelihood ratio; Q: questionnaire; Per: peripheral; D: diagnosis; US: ultrasound; PPV: positive predictive value; NPV: negative predictive value.