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Table 4 Mean airway proportions using cricoid area and age appropriate endotracheal tube size area as the denominators and their comparison p values. ACR = airway/cricoid area ratio and AER = airway/ETT area ratio.

From: Airway sizes and proportions in children quantified by a video-bronchoscopic technique

  Cricoid RMS RBI RLL LMS LLL LUL
n 125 114 100 90 108 97 89
ACR 1.00 0.85 0.73 0.55 0.68 0.48 0.42
AER 1.20 1.00 0.87 0.60 0.80 0.54 0.47
p-value 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001