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TABLE 1: 
Parameters of patients according to stages of OSAS and control group
ParametersControl Group (n = 24) (mean ± SD)Mild/Moderate OSAS (n = 27) (mean ± SD)Severe OSAS (n = 20) (mean ± SD)P* Value
Age (y)46.0 ± 14.349.0 ± 6.049.0 ± 10.0.533
BMI (kg/m2)34.1 ± 7.033.9 ± 5.731.7 ± 5.1.357
Neck circumference (cm)37.4 ± 4.438.3 ± 4.240.6 ± 3.8.043
AHI2.1 ± 1.413.9 ± 6.750.8 ± 15.6.000
Uvula tidal breathing area (mm2)233.2 ± 89.9224.7 ± 68.6202.8 ± 76.7.418
Uvula inspiration area (mm2)215.2 ± 94.3247.4 ± 107.6205.7 ± 146.7.425
Uvula expiration area (mm2)205.6 ± 106.3219.6 ± 82.7137.2 ± 73.6.007
Hypopharynx tidal breathing area (mm2)349.2 ± 117.8257.1 ± 88.7366.2 ± 137.2.453
Hypopharynx inspiration area (mm2)333.8 ± 118.4338.6 ± 131.8345.6 ± 146.8.698
Hypopharynx expiration area (mm2)272.8 ± 107.5323.6 ± 150.0307.0 ± 140.2.344
MP-H (mm)15.0 ± 5.715.2 ± 6.420.0 ± 8.1.029
PNS-U (mm)35.0 ± 3.634.9 ± 4.137.5 ± 6.1.120
SP-max (mm)10.0 ± 2.09.6 ± 2.211.6 ± 2.2.009
SNA (angle)81.5 ± 4.981.3 ± 6.284.0 ± 5.0.211
SNB (angle)79.3 ± 4.079.1 ± 5.181.1 ± 5.3.347
ANB (angle)2.1 ± 3.61.9 ± 3.42.9 ± 3.4.628
  • Note.—OSAS indicates obstructive sleep apnea syndrome; AHI, apnea-hypopnea index; MP-H, distance from mandibulas plane to the hyoid bone; PNS-U, distance from the posterior nasal spine to the tip of the uvula; SP-max, maximum distance of the soft palate perpendicular to PNS-U; SNA, SNB, ANB, angles where S is the midpoint of the sella, N is the nasion, A is the deepest point on the premaxillary outer contour, and B is the deepest point on the outer mandibular contour.
  • * Compared by using the one-way ANOVA. Significant values are shown in boldface.