Comparative Evaluation of the Sniffing Position with Simple Head Extension for Laryngoscopic View and Intubation Difficulty in Adults Undergoing Elective Surgery

Table 2

Comparison of views obtained during laryngoscopy.

Cormack and Lehane	Sniffing position	Simple extension	𝑃 value
	(𝑛=275)	(𝑛=271)
Grade 1	171 (62.2)	145 (53.5)	0.144
Grade 2	82 (29.8)	101 (37.3)
Grade 3	21 (7.6)	25 (9.2)
Grade 4	1 (0.4)	0 (0)

Values are numbers (percent).