Accuracy of post-exertion change in oxygen saturation from baseline at a range of thresholds for positivity, secondary analysis (N=652)
| Threshold | Sensitivity (95% CI) | Specificity (95% CI) | Positive likelihood ratio (95% CI) | Negative likelihood ratio (95% CI) |
| <=−1 | 87.5 (61.7 to 98.4) | 44.5 (40.6 to 48.5) | 1.58 (1.30 to 1.93) | 0.28 (0.08 to 1.03) |
| <=−2 | 56.3 (29.9 to 80.2) | 60.4 (56.5 to 64.2) | 1.42 (0.91 to 2.21) | 0.72 (0.41 to 1.26) |
| <=−3 | 56.3 (29.9 to 80.2) | 71.5 (67.9 to 75.0) | 1.98 (1.26 to 3.10) | 0.61 (0.35 to 1.07) |
| <=−4 | 43.8 (19.8 to 70.1) | 79.1 (75.7 to 82.2) | 2.09 (1.18 to 3.72) | 0.71 (0.46 to 1.10) |
| <=−5 | 43.8 (19.8 to 70.1) | 83.6 (80.5 to 86.4) | 2.68 (1.50 to 4.80) | 0.67 (0.43 to 1.03) |
| <=−6 | 31.3 (11.0 to 58.7) | 87.1 (84.3 to 89.6) | 2.42 (1.14 to 5.15) | 0.79 (0.57 to 1.10) |
| <=−7 | 25.0 (7.3 to 52.4) | 91.5 (89.1 to 93.6) | 2.94 (1.21 to 7.13) | 0.82 (0.62 to 1.09) |
| <=−8 | 25.0 (7.3 to 52.4) | 92.8 (90.5 to 94.7) | 3.46 (1.42 to 8.45) | 0.81 (0.61 to 1.08) |
| <=−9 | 18.8 (4.0 to 45.6) | 94.3 (92.2 to 96.0) | 3.31 (1.14 to 9.63) | 0.86 (0.68 to 1.09) |
| <=−10 | 12.5 (1.6 to 38.3) | 95.8 (93.9 to 97.2) | 2.94 (0.76 to 11.32) | 0.91 (0.76 to 1.10) |