Fig. 2From: Development and validation of a screening method for difficult tracheal intubation based on geometric simulation and computer technologyExamples of the change in input variables to the change in calculation results. All graphs are scaled the same. a to b height, 180 cm to 160 cm; b to c Head-up angle, grade 1 to grade 2; a to d thyromental distance, 9 cm to 7 cm; d to e TMJ range of motion 15 mm to 5 mm; e to f tongue thickness, 5.5 to 7 cm. Abbreviation: TMJ, temporomandibular jointBack to article page