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Table 4 Measurements and comparison of the pharyngeal airway in group 1 (BSSRO)

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

T2

T3

T0–T1

T0–T2

T0–T3

T1–T2

T2–T3

Mean ± SD

Nph AP

13.35 ± 2.80

12.39 ± 2.63

12.60 ± 2.70

12.48 ± 2.16

0.022*

0.070

0.065

0.630

0.761

Oph AP

12.30 ± 4.31

10.05 ± 4.20

10.20 ± 3.72

11.12 ± 4.33

0.000**

0.001**

0.025*

0.783

0.095

Hph AP

17.70 ± 4.55

15.93 ± 4.00

15.30 ± 4.14

16.67 ± 4.98

0.016*

0.003**

0.184

0.279

0.038*

Nph vol

6.23 ± 2.84

5.89 ± 2.93

5.65 ± 2.53

5.53 ± 2.73

0.239

0.049*

0.089

0.308

0.645

Oph vol

6.04 ± 2.80

4.24 ± 2.27

4.46 ± 2.49

4.10 ± 2.06

0.000**

0.000**

0.000**

0.516

0.245

Hph vol

7.80 ± 3.99

5.94 ± 3.84

5.93 ± 3.09

6.04 ± 3.65

0.000**

0.000**

0.002**

0.982

0.750

Whole pharynx vol

20.07 ± 8.22

16.07 ± 7.52

16.03 ± 6.70

15.67 ± 7.17

0.000**

0.000**

0.001**

0.962

0.622

SV-B

64.97 ± 7.88

60.12 ± 5.46

60.52 ± 6.09

60.86 ± 5.51

0.000**

0.000**

0.000**

0.466

0.321

  1. *Significant at p < 0.05, **Significant at p < 0.01
  2. 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, SV-B distance from the sella vertical plane to the B point