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Table 5 Comparison of the volumetric 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 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
  1. 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.
  2. Abbreviations: T0 preoperatively, T1 immediate postoperatively, T2 after 6 months postoperatively, SD standard deviation