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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.
