Table 1. Airway Difficulty Scores.

	1	2	3
Thyromental distance	>6 cm	5-6 cm	<5 cm
Mallampati score	Class I	Class II	Classes III-IV
Mouth opening	4 cm	2-3 cm	1 cm
Neck mobility	Normal	Reduced	Fixed flexion
Upper incisors	Absent	Normal	Prominent

Total scores =15, difficult intubation ≥ 8.