Fig. 3. Changes of the glottic aperture angle in each group. Upper and lower sides of boxes represent the twenty-fifth and seventy-fifth percentiles, horizontal lines inside boxes are medians, and end of vertical lines denote tenth and ninetieth percentiles. Each symbol represents a different subject. After = after surgery; before = before surgery; ETT = endotracheal tube; LMA ™=Laryngeal Mask Airway ™. *P < 0.05 versus before surgery.