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Table 2 Intubation attempts and visualization of the glottis using the Cormack & Lehane grade

From: Endotracheal intubation using the C-MAC® video laryngoscope or the Macintosh laryngoscope: A prospective, comparative study in the ICU

  Attempts (n) Cormack & Lehane grade
Macintosh laryngoscopy   
   Junior 1 (1 to 1); 1 to 3 2 (1 to 2); 1 to 3
   Senior 1 (1 to 1); 1 to 4 1 (1 to 2); 1 to 2
   Specialist 1 (1 to 2); 1 to 4 1 (1 to 2); 1 to 4
   P value 0.36 0.22
C-MAC® video laryngoscope   
   Junior 1 (1 to 1); 1 to 1 1 (1 to 2); 1 to 4
   Senior 1 (1 to 1); 1 to 5 1 (1 to 1); 1 to 4
   Specialist 1 (1 to 1); 1 to 3 1 (1 to 2); 1 to 4
   P value 0.91 0.39
P value (ML vs. C-MAC®)   
   Junior 0.54 0.14
   Senior 0.60 0.98
   Specialist 0.10 0.17
  1. Data presented as median (interquartile range); range. Junior, < 1 to 3 years of clinical experience; senior, > 3 years of clinical experience; specialist, board-certified anesthesiologist. ML, Macintosh laryngoscopy.