Receiver operator curve analyses for predicting hypercapnia: sensitivity and specificity ranges for men and women
| Cut-off level | Sensitivity | Specificity | |
|---|---|---|---|
| All SpO2 | <95% | 83 (76 to 88) | 63 (51 to 73) |
| All FVC | <3.0 L | 90 (84 to 94) | 41 (30 to 52) |
| Men SpO2 | <95% | 76 (65 to 85) | 64 (51 to 76) |
| Men FVC | <3.5 L | 85 (74 to 92) | 29 (18 to 42) |
| Women SpO2 | <93% | 74 (63 to 82) | 63 (41 to 81) |
| Women FVC | <2.3 L | 99 (94 to 100) | 17 (5 to 37) |
FVC, forced vital capacity; SpO2, oxygen saturations.