Fig. 2
From: Nomograms for predicting difficult airway based on ultrasound assessment
Nomogram predicting difficult tracheal intubation in patients underwent general anesthesia tracheal intubation. Abbreviations: ULBT, upper lip bite test; MMT, modified Mallampati test; TMJ, temporomandibular joint mobility by mandibular condylar mobility measured by ultrasonography; IID, interincisor distance; TT, tongue thickness measured by ultrasonography; DTI, difficult tracheal intubation