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021) and low-angle groups ( = 0.013). Furthermore, the lower airway width in the high angle group was significantly narrower than the normal angle ( = 0.02 and low-angle groups ( = 0.017). There were no statistically significant differences between normal and low angle groups. The upper and lower pharyngeal widths in the Class I high-angle group were significantly narrower than those in the normal-angle and low-angle groups. The upper and lower pharyngeal widths in the Class I high-angle group were significantly narrower than those in