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. 2011 Jan 17;19:4. doi: 10.1186/1757-7241-19-4

Figure 1.

Figure 1

Graphs representing the time until first ventilation for the Macintosh, the McGrath® and the GlideScope® laryngoscopes for all six attempts in a normal airway. Mean ± SD. * = p < 0.05, ** = p < 0.01, *** = p < 0.001.