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

Table 4

Intubation Difficulty Scale (IDS) score.

IDS score	Sniffing position	Simple extension	𝑃 value
	(𝑛=275)	(𝑛=271)
0	166 (60.4)	129 (47.6)	0.005
0–5	105 (38.2)	142 (52.4)
>5	4 (1.5)	0 (0)

Values are numbers (percent).