Table 2.

Intubation parameters in the cervical immobilized manikin

	McGrath (n = 105)	Pentax (n = 105)	Macintosh (n = 105)	p-value
Total success rate	105 (100)	105 (100)	103 (98)	0.331
1st attempt success	105 (100)	105 (100)	95 (91)	< 0.001
Intubation time	22 [15–34]	22 [13–33]	25 [18–40]	0.012
Incidence of dental click	23 (22)	36 (34)	48 (46)a	0.001
Difficulty grade	3 [2–5]	3 [2–4]	5 [3.5–7]	< 0.001
Glottic grade				< 0.001
I	77 (73)	83 (79)	13 (12)
IIa	4 (4)	7 (7)	12 (11)
IIb	24 (23)	15 (14)	64 (62)
III	0 (0)	0 (0)	14 (13)
IV	0 (0)	0 (0)	2 (2)

Values are number of patients (%) or median [interquartile range]. Intubation success, tracheal intubation performed within three attempts during 120 s; Intubation time, defined as the time from passage of the laryngoscope blade past the manikin teeth to successful ventilation using an Ambu bag; Dental click, when a click sound from the manikin teeth was heard during intubation; Difficulty grade, graded using a 11-point numeric rating scale (0; extremely easy–10; extremely difficult); Glottic grade, graded using the Cormack Lehane grading system

^ap < 0.05/3, vs. McGrath group