Table 3. Performances of the six confirmatory questions of the questionnaire.
| Sensitivity % (95% CI) | Specificity % (95% CI) | PPV % (95% CI) | NPV % (95% CI) | |
|---|---|---|---|---|
| Question 1 | 50.0 (29.1–70.9) | 66.7 (29.9–92.5) | 80.0 (51.9–95.7) | 33.3 (13.3–59.0) |
| Question 2 | 58.3 (36.6–77.9) | 90.9 (58.7–99.8) | 99.3 (68.0–99.8) | 50.0 (27.2–72.8) |
| Question 3 | 76.0 (54.9–90.6) | 58.3 (27.7–84.8) | 79.2 (57.8–92.9) | 53.8 (5.1–80.8) |
| Question 4 | 50.0 (29.9–70.1) | 88.9 (51.7–99.7) | 92.9 (66.1–99.8) | 38.1 (18.1–61.6) |
| Question 5 | 82.6 (61.2–95.0) | 10.0 (0.2–44.5) | 67.9 (47.6–84.1) | 20.0 (0.51–71.6) |
| Question 6 | 76.9 (56.3–91.0) | 25.0 (5.5–57.2) | 69.0 (49.2–84.7) | 33.3 (7.5–70.1) |
CI, confidence interval; PPV, positive predictive value; NPV, negative predictive value.