Table 1: Demographic, sleep study, IOS, and pharyngeal airway caliber data before and after surgery.

Preoperative Postoperative
BMI (kg/m2) 20.4 19.7
3% ODI (dips/h) 1.32 0.67
Mean SpO2 (%) 97.43 97.41
Lowest SpO2 (%) 88.00 93.00
IOS (kPa/L/s)
R5 (sitting) 0.43 0.34
R20 (sitting) 0.34 0.30
R5 (supine) 0.42 0.33
R20 (supine) 0.33 0.29
Pharyngeal airway
PRL-PSP (mm) 24 27
PRL-PTO (mm) 21 23
PRL-E (mm) 12 14

BMI: Body mass index; ODI: Oxygen desaturation index; IOS: Impulse oscillometry; R5 and R20: Total and central airway resistance, respectively.
For definitions of pharyngeal airway dimensions, see Figure 5.