Table 4 Sensitivity, specificity, predictive values and likelihood ratios of the various questionnaires in relation to AHI and desaturation during bronchoscopy

Using sleep apnea assessed by polygraphy as reference standard

 Sensitivity

59

20

58

69

 Specificity

43

86

64

79

 Positive predictive value

91

93

94

97

 Negative predictive value

10

10

14

21

  Positive likelihood ratio

1.0

1.6

1.6

3.2

 Negative likelihood ratio

0.96

0.94

0.66

0.4

Using desaturation during bronchoscopy as reference standard

 Sensitivity

60

18

58

67

 Specificity

54

69

69

62

 Positive predictive value

93

86

95

95

 Negative predictive value

12

7.7

14

15

 Positive likelihood ratio

1.3

0.59

1.9

1.8

 Negative likelihood ratio

0.74

1.2

0.61

0.54