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Table 2 Sensitivity and specificity of various CO cut-off levels

From: Comparison of CO breath testing and women's self-reporting of smoking behaviour for identifying smoking during pregnancy

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