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Table 2 Values of the head extension and laryngoscope blade levering motion angles during conventional and balloon laryngoscopy

From: Balloon laryngoscopy reduces head extension and blade leverage in patients with potential cervical spine injury

 

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

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