Table 2

Values of the head extension and laryngoscope blade levering motion angles during conventional and balloon laryngoscopy

Conventional Macintosh blade

Modified Macintosh blade

P

Angle of head extension

8.29 ± 1.57

4.91 ± 1.42

< 0.001

Angle of laryngoscope blade levering motion

10.76 ± 1.75

5.53 ± 2.13

< 0.001

Values are expressed as mean ± standard deviation in degrees. P values were obtained by using the paired t-test.

Mentzelopoulos et al. Critical Care 2000 4:40   doi:10.1186/cc648