Table 1 Measurements for the Syndaver, Laerdal, and SimAir manikins obtained from hand measuring* and CT scans compared to human measurements from literature

Height mouth opens (cm)

4.78±0.83

5.98 (0.93)

–

4.52 (0.38)

–

8.10 (0.99)

–

Neck circumference (cm)

36.6±3.5

33.4 (0.18)

36.02 (0.43)

43.55 (0.98)

42.84 (0.96)

41.23 (0.91)

40.15 (0.85)

Tracheal length (cm)

8.6±1.1

9.54 (0.8)

9.04 (0.66)

3.27 (0.0)

3.30 (0.0)

7.83 (0.24)

8.01 (0.30)

Epiglottis tip—posterior pharyngeal wall (cm)

0.9±0.4

1.67 (0.97)

1.54 (0.95)

3.54 (0.99)

2.35 (0.99)

1.48 (0.93)

1.10 (0.69)

Angle right main stem bronchus (°)

25

49.57

53.80

29.15

32.37

19.67

–

Total airway volume (cm³)

22.5±9.0

–

106.72 (0.99)

–

170.18 (0.99)

–

104.84 (0.99)

Oral pharynx volume (cm³)

3.6±2.6

–

20.06 (0.99)

–

27.37 (0.99)

–

7.99 (0.95)