Table 3.

Difficulty of Mask Ventilation Based on Han Scores and Warters Scores by Mask Type Before and After NMB

Score Source	Pre-NMB	P	Post-NMB	P
Han scores
Easy by both standard and Tao masks	143 (94.1)	.157	148 (97.4)	1.00
Difficult by both standard and Tao masks	7 (4.61)		4 (2.63)
Easy with Tao mask, difficult with standard mask	2 (1.32)		0 (0.00)
Easy with standard mask, difficult with Tao mask	0 (0.00)		0 (0.00)
Warters scores
Easy by both standard and Tao masks	110 (72.4)	<.001	135 (88.8)	.005
Difficult by both standard and Tao masks	18 (11.8)		9 (5.92)
Easy with Tao mask, difficult with standard mask	22 (14.5)		8 (5.26)
Easy with standard mask, difficult with Tao mask	2 (1.32)		0 (0.00)

alues are reported as n (%). P values are based on McNemar test of agreement with a significant value indicating that more participants report difficulty with the standard mask but not with the Tao mask compared to those who report difficulty with the Tao mask but not the standard mask.

Abbreviation: NMB, neuromuscular blockade.