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

Maxillofacial Plastic and Reconstructive Surgery

Table 5 Comparison of the volumetric 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	5363.45 (1895.90) 100 %	5013.05 (1562.34) 93.5 %	5214.30 (1892.05) 97.2 %	.137	.405	.358
Oropharynx	17,833.09 (9130.96) 100 %	10,989.30 (6776.01) 61.6 %	11,860.33 (6187.34) 66.5 %	<.001	.361	<.001
Hypopharynx	7175.34 (5344.89) 100 %	4635.66 (2513.35) 64.6 %	4568.04 (2324.86) 63.7 %	.010	.836	.007
Total	30,371.88 (13,547.62) 100 %	20,638.01 (9585.39) 68.0 %	21,642.67 (9164.16) 71.3 %	<.001	.445	<.001

Volumetric measurements are expressed by cubic 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