CO cut-off ≥ (p.p.m.) | Sensitivity | Specificity | (Sensitivity + specificity)/2 |
---|---|---|---|
1 | 1.000 | 0.000 | 0.50 |
2 | 1.000 | 0.367 | 0.68 |
3 | 0.996 | 0.700 | 0.85 |
4 | 0.996 | 0.883 | 0.94 |
5 | 0.996 | 0.933 | 0.96 |
6 | 0.988 | 0.933 | 0.96 |
7 | 0.960 | 0.933 | 0.95 |
8 | 0.912 | 0.933 | 0.92 |
9 | 0.888 | 0.950 | 0.92 |
10 | 0.855 | 0.967 | 0.91 |