Change of the airway space in mandibular prognathism after bimaxillary surgery involving maxillary posterior impaction

Maxillofacial Plastic and Reconstructive Surgery

Table 4 Comparison of the linear measurement on preoperatively (T0), immediate postoperatively (T1), and after 6 months postoperatively (T2)

n = 22	T0	T1	T2	P value
n = 22	Mean (SD) percentage	Mean (SD) percentage	Mean (SD) percentage	T0–T1	T1–T2	T0–T2
Nasopharynx	19.74 (3.77) 100 %	19.15 (3.24) 97.0 %	19.43 (3.89) 98.4 %	.160	.556	.339
Oropharynx	17.54 (5.07) 100 %	13.58 (4.58) 77.4 %	14.33 (4.04) 81.7 %	<.001	.253	.001
Hypopharynx	18.21 (6.17) 100 %	14.86 (4.20) 81.6 %	14.81 (3.94) 81.3 %	.001	.932	.001

Linear measurements are expressed by millimeters. The preoperative state (T0) was defined as 100 %. The paired t test was used, and P values <.05 are statistically significant
Abbreviations: T0 preoperatively, T1 immediate postoperatively, T2 after 6 months postoperatively, SD standard deviation