Table 3 Ease of intubation in the second position (during period 2)
|  | Head-flat position (n = 32) | Head-elevated position (n = 32) | P value |
|---|---|---|---|
Patients requiring optimization maneuvers | 17 (53.1) | 7 (21.9) | 0.01 |
 Blade withdrawal | 2 (6.2) | 2 (6.2) |  |
 External laryngeal manipulation | 11 (34.4) | 7 (21.9) |  |
 Increased lifting force | 7 (21.9) | 1 (3.1) |  |
 Tracheal tube bending | 2 (6.2) | 1 (3.1) |  |
 Stylet added | 4 (12.5) | 2 (6.2) |  |
 Tracheal tube rotation | 1 (3.1) | 0 (0) |  |
Time to intubation, s | 26.6 (22.1 to 32.7) | 22 (19.4 to 30.1) | 0.11 |
Intubation Difficulty Scale score | 1 (1 to 3) | 1 (0.5 to 1) | 0.13 |