Determining Optimal Cutoffs for Exhaled Carbon Monoxide and Salivary Cotinine to Identify Smokers among Korean Americans in a Smoking Cessation Clinical Trial
Table 3
Sensitivity and specificity of various breath carbon monoxide cutoff levels at each follow-up.
CO cutoff (ppm)
Follow-up
Sensitivity
Specificity
ROC area
4
1 month
0.923
0.726
0.824
3 months
0.933
0.837
0.885
6 months
0.889
0.912
0.900
12 months
0.983
0.710
0.846
5
1 month
0.808
1.000
0.904
3 months
0.911
1.000
0.956
6 months
0.889
1.000
0.944
12 months
0.983
1.000
0.991
6
1 month
0.654
1.000
0.827
3 months
0.822
1.000
0.911
6 months
0.870
1.000
0.935
12 months
0.930
1.000
0.965
7
1 month
0.500
1.000
0.750
3 months
0.711
1.000
0.856
6 months
0.852
1.000
0.926
12 months
0.930
1.000
0.965
The number of participants varied at each follow-up: 82 at 1 month, 80 at 3 months, 78 at 6 months, and 79 at 12 months.
