Skip to main content

Table 6 Comparison of the amount of changes between group 1 (BSSRO) and group 2 (BSSRO + Le Fort I osteotomy)

From: Postoperative changes in the pharyngeal airway space through computed tomography evaluation after mandibular setback surgery in skeletal class III patients: 1-year follow-up

Variable T0–T1 T1–T2 T2–T3 T0–T3
Average of change P value Average of change P value Average of change P value Average of change P value
ΔNph AP (mm) Group 1 0.96 0.422 − 0.21 0.284 0.12 0.549 0.87 0.756
Group 2 0.45 0.51 − 0.31 0.66
ΔOph Ap (mm) Group 1 2.25 0.668 − 0.15 0.306 − 0.92 0.221 1.18 0.333
Group 2 1.44 0.96 − 3.61 − 1.20
ΔHph AP (mm) Group 1 1.76 0.025* 0.63 0.568 − 1.37 0.078 1.03 0.225
Group 2 − 0.82 0.14 0.30 − 0.40
ΔNph vol (cm3) Group 1 0.33 0.392 0.24 0.409 0.11 0.008** 0.69 0.116
Group 2 0.84 − 0.14 − 1.04 − 0.33
ΔOph vol (cm3) Group 1 1.80 0.500 − 0.21 0.049* 0.37 0.004** 1.95 0.003**
Group 2 1.26 0.88 − 1.85 0.29
ΔHph vol (cm3) Group 1 1.86 0.011* 0.01 0.094 − 0.11 0.293 1.76 0.093
Group 2 − 0.21 1.32 − 0.74 0.38
ΔWhole pharynx volume (cm3) Group 1 3.99 0.246 0.01 0.141 0.37 0.004** 4.40 0.023*
Group 2 1.89 2.06 − 3.62 0.34
  1. Independent t-test was performed
  2. *Significant at p < 0.05, **Significant at p < 0.01
  3. BSSRO bilateral sagittal split ramus osteotomy, T0 before surgery, T1 2 months after surgery, T2 6 months after surgery, T3 1 year after surgery, Nph AP anteroposterior distance of nasopharynx, Oph AP anteroposterior distance of oropharynx, Hph AP anteroposterior distance of hypopharynx, Nph vol nasopharynx volume, Oph vol oropharynx volume, Hph vol hypopharynx volume