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Causes of unsuccessful laryngoscopy in the two groups
| Variable | Inappropriate tongue position | Blade outside vallecula | Laryngoscope loss in the posterior larynx | P-value | |
| 1st attempt | DL | 18 (72) | 7 (28) | - | 0.066 |
| VL | 23 (92) | 2 (8) | - | ||
| 2nd attempt | DL | 11 (44) | 11 (44) | 1 (4) | 0.08 |
| VL | 4 (16) | 12 (48) | 9 (36) | ||
| 3rd attempt | DL | 3 (12) | 11 (44) | 1 (4) | 0.141 |
| VL | - | 10 (40) | 3 (12) | ||
| VL: GlideScope video laryngoscopy; DL: direct laryngoscopy |
