Parameter | Cut off level | Sensitivity (%) | Specificity (%) | Positive predictivity (%) |
Fetco 2 | <4% | 87 | 77 | 82 |
ΔFetco 2 | <–0.5% | 81 | 92 | 93 |
V˙e/V˙o 2 | >37 | 93 | 100 | 100 |
ΔV˙e/V˙o 2 | >5 | 75 | 100 | 100 |
V˙e/V˙co 2 | >47 | 69 | 100 | 92 |
ΔV˙e/V˙co 2 | >5 | 69 | 92 | 92 |
Fetco 2 = end expiratory tidal CO2 fraction;V˙e/V˙o 2,V˙e/V˙co 2 = ventilatory equivalents for O2 and CO2; sensitivity = true positives/(true positives + false negatives)%; specificity = true negatives/(true negatives + false positives)%; positive predictivity = true positives/(true positives + false positives)%.
Estimates are based on test result distributions of patients with HVS (n = 16) and healthy controls (n = 13).