Sensitivity, specificity, likelihood ratios(LRs), positive predictive values (PPVs) and negative predictive values (NPVs) at different cut-off points of exhaled nitric oxide fraction (FeNO) values
| FeNO ppb | Sensitivity % | Specificity % | Positive LR | Negative LR | PPV | NPV |
| 20 | 90 (76.9–96.0) | 81.1 (68.6–89.4) | 4.77 (2.70–8.42) | 0.12 (0.05–0,32) | 78.3 (64.4–87.7) | 91.5 (80.1–96.6) |
| 25 | 90 (76.9–96.0) | 84.9 (72.9–92.1) | 5.96 (3.12–11.39) | 0.12 (0.05–0.30) | 81.8 (68.0–90.5) | 91.8 (80.8–96.8) |
| 30 | 87.5 (73.9–94.5) | 90.6 (79.7–95.9) | 9.28 (3.99–21.53) | 0.14 (0.06–0.32) | 87.5 (73.9–94.5) | 90.6 (79.7–95.9) |
| 35 | 77.5 (62.5–87.7) | 90.6 (79.7–95.9) | 8.22 (3.51–19.23) | 0.25 (0.14–0.45) | 86.1 (71.3–93.9) | 84.2 (72.6–91.5) |
| 40 | 70.0 (54.6–81.9) | 94.3 (84.6–98.1) | 12.37 (4.04–37.81) | 0.32 (0.20–0.51 | 90.3 (75.1–96.7) | 80.6 (69.1–88.6) |
| 45 | 67.5 (52.0–79.9) | 94.3 (84.6–98.1) | 11.93 (3.89–36.55) | 0.34 (0.22–0.54) | 90.0 (74.4–96.5) | 79.4 (67.8–87.5) |
| 50 | 42.5 (28.5–57.8) | 94.3 (84.6–98.1) | 7.51 (2.36–23.87) | 0.61 (0.46–0.81) | 85.0 (64.0–94.8) | 68.5 (57.1–78.0) |
Data are presented with 95% confidence intervals.