CO cut-off (p.p.m.) | Sensitivity | Specificty | (Sensitivity + specificity)/2 |
---|---|---|---|
0 | 1 | 0 | 0.5 |
1 | 1 | 0.2 | 0.6 |
2 | 0.857 | 0.897 | 0.88 |
3 | 0.832 | 0.930 | 0.88 |
4 | 0.777 | 0.960 | 0.87 |
5 | 0.729 | 0.974 | 0.85 |
6 | 0.685 | 0.982 | 0.83 |
7 | 0.643 | 0.984 | 0.81 |
8 | 0.594 | 0.987 | 0.79 |
9 | 0.559 | 0.989 | 0.77 |
10 | 0.502 | 0.990 | 0.75 |
11 | 0.465 | 0.992 | 0.73 |
12 | 0.408 | 0.995 | 0.70 |