Table 2.

Sensitivity and specificity of various cut-off levels of eBCO against recent and ever cigarette smoking.

Smoking status	Sensitivity & Specificity
Recent Smokers
Label	−1	0.5	1.50	2.50	3.50	4.50	5.50	6.50	7.50	9.00	11.00
Sensitivity	1.00	1.00	1.00	0.983	0.932	0.847	0.746	0.627	0.051	0.017	0.000
Specificity	0.00	0.026	0.10	0.324	0.508	0.655	0.847	0.903	0.989	0.997	1.00
Sensitivity + Specificity	1.00	1.026	1.10	1.307	1.44	1.502	1.593	1.53	1.04	1.014	1.00
1-specificity	1.00	0.974	0.900	0.676	0.492	0.345	0.153	0.097	0.011	0.003	0.000
Ever Smokers
Sensitivity	1.00	1.00	1.00	0.948	0.851	0.747	0.466	0.333	0.029	0.006	0.000
Specificity	0.00	0.038	0.145	0.435	0.641	0.805	0.920	0.939	0.992	0.996	1.00
Sensitivity + Specificity	1.00	1.038	1.145	1.383	1.492	1.552	1.385	1.272	1.021	1.002	1.00
1-specificity	1.00	0.962	0.855	0.565	0.359	0.195	0.080	0.061	0.008	0.004	0.000