Fig. 5. ( A ) and ( B ): Bland and Altman plots for all 100 adults and 50 children, respectively (○= male; •= female). The means of the differences between the two lengths were 1.03 cm (95% CI 0.86 ∼ 1.20) in adults, and 0.63 cm (95% CI 0.46 ∼ 0.79) in children. The incisor-carina neutral length is the length from the upper incisor to the carina after intubation with a flexible fiberoptic bronchoscope through the endotracheal tube in neutral position. The incisor-MSJ extension length is the straight length from upper incisor to the manubriosternal joint (MSJ) in extended position.