Figure 3. The cervical spine extension (occiput-C5) and the times to intubation with each of the intubation sequences. Standard error bars are included. Time to intubation is fastest when using the Macintosh laryngoscope without ILS, but cervical spine extension is greatest. The cervical spine extension and times to intubation are similar with the Macintosh laryngoscope with ILS and the Bullard laryngoscope without ILS. The least amount of cervical spine extension is seen when using the Bullard laryngoscope with ILS.