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![<bold>Figure 1. </bold>](/view/journals/anpr/66/1/inline-i0003-3006-66-1-8-f01.png)
A cephalometric analysis of oral and nasal airway length. We employed 4 landmarks for oral airway and 5 landmarks for nasal airway. These landmarks were smoothly connected by using the DICOM viewer.
![<bold>Figure 2.</bold>](/view/journals/anpr/66/1/inline-i0003-3006-66-1-8-f02.png)
Correlation between patient height and oral tract length. A strong correlation between patient height and the length of the oral tract was confirmed (r = 0.691; p > .01). No significant difference was seen between separate plots for men and women.
![<bold>Figure 3.</bold>](/view/journals/anpr/66/1/inline-i0003-3006-66-1-8-f03.png)
Correlation between patient height and nasal tract length. A strong correlation between patient height and the length of the nasal tract was confirmed (r = 0.760; p > .01). No significant difference was seen between separate plots for men and women.
![<bold>Figure 4.</bold>](/view/journals/anpr/66/1/inline-i0003-3006-66-1-8-f04.png)
Bland-Altman plots for the bias between the estimated and measured values of oral tract length. A significant fixed bias was observed (p < .05).
![<bold>Figure 5.</bold>](/view/journals/anpr/66/1/inline-i0003-3006-66-1-8-f05.png)
Bland-Altman plots for the bias between the estimated and measured values of nasal tract length. No significant fixed bias or proportional bias was observed (p > .05).
![<bold>Figure 6.</bold>](/view/journals/anpr/66/1/inline-i0003-3006-66-1-8-f06.png)
Intubation marker of the endotracheal tube. The distance to add to the airway length to help ensure appropriate tube depth (DM; distance between the distal edge of intubation guide mark and the tip).