Table 2 Morphologic change of the airway space

 C1AP*

13.15 ± 4.56

10.11 ± 3.69

 C2AP*

13.95 ± 4.36

10.99 ± 3.85

 C3AP*

14.63 ± 3.50

12.29 ± 4.92

 C1LW

23.28 ± 4.63

20.38 ± 4.38

 C2LW*

27.52 ± 6.70

24.13 ± 4.31

 C3LW

31.86 ± 7.44

27.76 ± 8.50

 C1A*

237.79 ± 79.37

167.68 ± 67.05

 C2A*

290.04 ± 128.14

209.87 ± 84.74

 C3A*

283.51 ± 80.07

219.92 ± 84.11

 Upper airway

6.95 ± 2.80

6.70 ± 2.27

 Lower airway*

9.01 ± 2.71

6.78 ± 1.87

 Oropharyngeal airway*

4.87 ± 1.80

3.48 ± 0.92

 Hypopharyngeal airway

3.98 ± 1.34

3.21 ± 1.28

 Total airway

15.95 ± 4.82

13.48 ± 3.54