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Table 2 Sensitivity and specificity of various breath carbon monoxide (BCO) cutoff levels

From: Using breath carbon monoxide to validate self-reported tobacco smoking in remote Australian Indigenous communities

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