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Table 1 The Cormack–Lehane (C–L) scale

From: Neck circumference to inter-incisor gap ratio: a new predictor of difficult laryngoscopy in cervical spondylosis patients

Classification

Description

Class I

vocal cords were completely visible

Class II

only the arytenoids were visible

Class III

only the epiglottis was visible

Class IV

the epiglottis was not visible