Table 1.

Mask ventilation grading with lateral pharyngeal wall measurements*

Grade		LPWT (cm)
1	Easy MV	2.26 ± 0.44
2	Difficult MV requiring an oral airway or other adjunct	2.73 ± 0.69**
3	Very difficult MV requiring two providers	3.32 ± 0.62**
4	Unable to MV	4.4

^*Mask ventilation (MV) scoring system as defined by Han et al⁹ with the corresponding mean and standard deviation measurements of the lateral pharyngeal wall thickness (LPWT).

**Statistically significant (P < 0.05).