Accuracy of post-exertion change in oxygen saturation from baseline at a range of thresholds for positivity, primary analysis (N=813)
| Threshold | Sensitivity (95% CI) | Specificity (95% CI) | Positive likelihood ratio (95% CI) | Negative likelihood ratio (95% CI) |
| <=−1 | 70.0 (50.6 to 85.3) | 43.6 (40.0 to 47.1) | 1.24 (0.97 to 1.58) | 0.69 (0.40 to 1.20) |
| <=−2 | 53.3 (34.3 to 71.7) | 59.3 (55.7 to 62.7) | 1.31 (0.93 to 1.85) | 0.79 (0.54 to 1.16) |
| <=−3 | 53.3 (34.3 to 71.7) | 70.1 (66.8 to 73.3) | 1.78 (1.25 to 2.53) | 0.67 (0.46 to 0.98) |
| <=−4 | 40.0 (22.7 to 59.4) | 77.3 (74.2 to 80.2) | 1.76 (1.11 to 2.78) | 0.78 (0.58 to 1.05) |
| <=−5 | 36.7 (19.9 to 56.1) | 82.2 (79.4 to 84.9) | 2.07 (1.26 to 3.39) | 0.77 (0.59 to 1.01) |
| <=−6 | 30.0 (14.7 to 49.4) | 86.1 (83.5 to 88.4) | 2.16 (1.22 to 3.83) | 0.81 (0.64 to 1.03) |
| <=−7 | 23.3 (9.9 to 42.3) | 90.5 (88.3 to 92.5) | 2.47 (1.25 to 4.89) | 0.85 (0.70 to 1.04) |
| <=−8 | 20.0 (7.7 to 38.6) | 92.5 (90.4 to 94.2) | 2.65 (1.24 to 5.65) | 0.87 (0.73 to 1.04) |
| <=−9 | 16.7 (5.6 to 34.7) | 94.0 (92.1 to 95.6) | 2.78 (1.19 to 6.48) | 0.89 (0.76 to 1.05) |
| <=−10 | 10.0 (2.1 to 26.5) | 95.1 (93.4 to 96.5) | 2.06 (0.67 to 6.30) | 0.95 (0.84 to 1.07) |