Table 2 Univariate logistic regression analysis results for difficult laryngoscopic exposure

Age (years)

51.24 ± 12.27

58.19 ± 10.20

1.05

1.01

1.08

0.02*

Gender (Male/Female)

493/577

26/24

2.17

0.99

4.74

0.05

BMI (kg/m²)

23.44 ± 2.80

26.16 ± 2.63

1.37

1.17

1.61

0.00*

Neck circumference (cm)

36.80 ± 3.58

40.10 ± 4.34

1.28

1.13

1.46

0.00*

Neck mobility (< 80°/≥80°)

993/77

29/21

0.11

0.04

0.32

0.00*

Thyromental Distance Ratio (cm/cm)

1.43 ± 0.15

1.36 ± 0.16

0.04

0.00

0.67

0.06

Mallampati Grade (1/2/3/4)

Mallampati Grade 1

Mallampati Grade 2

Mallampati Grade 3

151/739/180/0

3/35/11/1

0.00

0.00

0.00

0.00

0.00

0.00

0.37

1.00

1.00

1.00

Upper Lip Bite Test (1/2/3)

Upper Lip Bite Test 1

Upper Lip Bite Test 2

708/272/90

24/18/8

0.43

0.83

0.12

0.22

1.48

3.13

0.19

0.18

0.79

Snoring (None/Mild/Moderate/Severe)

Snoring 1

Snoring 2

Snoring 3

498/422/135/15

11/17/14/8

0.05

0.08

0.22

0.01

0.01

0.02

0.43

0.76

2.19

0.01*

0.01

0.03

0.20

Tongue Width(cm)

3.25 ± 0.37

3.31 ± 0.44

1.38

0.53

3.58

0.51

Tongue Thickness(cm)

5.96 ± 0.58

6.20 ± 0.46

2.27

0.87

4.82

0.09

Tongue Base Distance(cm)

3.97 ± 1.21

4.14 ± 0.59

1.12

0.57

2.22

0.74

Mentohyoid Distance Ratio (cm/cm)

1.43 ± 0.37

1.26 ± 0.16

1.62

0.14

18.34

0.07

Epiglottis Distance(cm)

2.06 ± 0.40

2.43 ± 0.14

2.03

0.75

5.50

0.11

Pre-epiglottic Space Area(cm²)

0.89 ± 0.11

1.11 ± 0.35

3.47

1.06

11.41

0.04*

Mandibular Joint Mobility Ratio (cm/cm)

1.41 ± 0.21

1.25 ± 0.14

0.30

0.05

1.78

0.22

Thyromental Distance(cm)

1.69 ± 0.34

1.94 ± 0.37

7.06

2.12

23.57

0.00*