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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