Table 1: Patient characteristics. Data as %, n (%), or mean SD.

Age, yrs
Sex, male64
BMI, kg/m2
Physical class‚ÄČ
 125 (20)
 248 (39)
 349 (40)
 41 (1)
Mallampati score ≥313 (11)
Thyromental distance <6 cm26 (21)
Interincisor gap <3 cm7 (6)
Reduced cervical mobility15 (12)
Cannot bite any part of upper lip6 (5)
History of difficult intubation2 (2)
>1 risk factor for difficult laryngoscopy13 (11)

BMI: body mass index.