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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