Test

Predicted difficult intubation

Difficult case detected

Sensitity

(%)

Specificity

(%)

Positive predictive value

Significance

p < 0.05

Sternomental

distance (cm)

22

8

87.5

81.7

31.8

0.00001

Thyromental

distance (cm)

32

5

62.5

67.1

15.6

0.09533

Mallampatti score

49

5

62.5

46.3

10.2

0.63173

Protrusion of mandible (A-C)

17

2

25

81.7

11.8

0.64363

Interincisal gap

49

4

50

45.1

8.2

0.79144