Table 3 Comparison among awake nasoendoscopy, videofluoroscopy, and drug-induced sleep endoscopy (DISE) findings regarding the degree and shape of airway collapse

Retro-palatal level

 Grade of collapse

  Grade I

0

0%

3

4.35%

0

0%

P = 0.006*

p1 = 0.261

p2 = 0.015*

p3 = 0.016*

  Grade II

6

8.70%

3

4.35%

0

0%

  Grade III

30

43.47%

30

43.47%

21

30.43%

  Grade IV

33

47.83%

33

47.83%

48

69.57%

 Shape of collapse

  Circular

63

91.30%

60

86.96%

63

91.30%

P = 0.621

p1 = 0.412

p2 = 1.0

p3 = 0.412

  Coronal

6

8.70%

9

13.04%

6

8.70%

Retro-glossal level

 Grade of collapse

  No collapse

6

8.70%

6

8.70%

3

4.35%

p = 0.037*

p1 = 0.970

p2 = 0.041*

p3 = 0.046*

   Grade I

3

4.35%

3

4.35%

3

4.35%

   Grade II

6

8.70%

6

8.70%

6

8.70%

   Grade III

42

60.86%

45

65.22%

33

47.82%

   Grade IV

12

17.39%

9

13.04%

24

34.78%

 Shape of collapse

N = 63

N = 63

N = 66

   Circular

48

76.19%

48

76.19%

54

81.8%

P = 0.669

p1 = 1.0

p2 = 0.432

p3 = 0.432

   Coronal

15

23.81%

15

23.81%

12

18.2%

Hypo-pharyngeal level

 Grade of collapse

  No collapse

12

17.39%

9

13.04%

6

8.70%

P = 0.003*

p1 = 0.963

p2 = 0.004*

p3 = 0.006*

   Grade I

6

8.70%

6

8.70%

3

4.35%

   Grade II

21

30.43%

21

30.43%

15

21.74%

   Grade III

24

34.78%

27

39.13%

21

30.43%

   Grade IV

6

8.70%

6

8.70%

24

34.78%

  Shape of epiglottis

   Flat

30

43.48%

30

43.48%

p2 = 1.0

   Curled

36

52.17%

36

52.17%

   Omega shaped

3

4.35%

3

4.35%