Assessment of Truflex™ articulating stylet versus conventional rigid Portex™ stylet as an intubation guide with the D-blade of C-Mac™ videolaryngoscope during elective tracheal intubation: study protocol for a randomized controlled trial

Table 1 Anticipated difficult airway (ADA) score ^*

Airway factors	Score
Airway factors	0	1	2
Mallampati classification	Class I	Class II	Class III to IV
Thyromental distance, cm	>6.5	6.0 to 6.5	<6.0
Head and neck movement, degrees	>90	90	<90
Body mass index, kg/m ²	<25	≥25	NA
Buck teeth	No	Mild	Severe
Inter-incisor gap, cm	>5.0	4.0 to 5.0	<4.0

^*Easy airway strata: ADA score ≤6; difficult airway strata: ADA score >6; NA- Not applicable.

ISSN: 1745-6215