Figure 4.

Graph representing the user rated degree of difficulty of use of each instrument in each scenario tested. The data are given as mean ± SD. * Indicates significantly different compared to both other Laryngoscopes. Labels: Normal – Start: Intubation of the normal airway at the start of the protocol; Cervical Immobilization – Immobilization of the neck with hard collar; Normal – End: Intubation of the normal airway at the end of the protocol.