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

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

n = 22 T0 T1 T2 P value
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
  1. 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
  2. Abbreviations: T0 preoperatively, T1 immediate postoperatively, T2 after 6 months postoperatively, SD standard deviation