| | Age, yrs | | | Sex, male | 64 | | BMI, kg/m2 | | | Physical class | | | 1 | 25 (20) | | 2 | 48 (39) | | 3 | 49 (40) | | 4 | 1 (1) | | Mallampati score ≥3 | 13 (11) | | Thyromental distance <6 cm | 26 (21) | | Interincisor gap <3 cm | 7 (6) | | Reduced cervical mobility | 15 (12) | | Cannot bite any part of upper lip | 6 (5) | | History of difficult intubation | 2 (2) | | >1 risk factor for difficult laryngoscopy | 13 (11) |
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