Table 3.

Relationship between BMI and relative risk of OSA with and without a history of SD.

Classification	BMI (kg/m2)	Relative Risk of OSA without History of SD	Relative Risk of OSA with History of SD
Underweight	< 18.5	0.55 (0.44–0.7)	8.99 (0.73–111.06)
Normal	18.5–24.9	1.00 (0.79–1.28)	16.38 (1.33–202.27)
Preobese	25.0–29.9	2.00 (1.58–2.54)	32.65 (2.64–403.04)
Class I obesity	30.0–34.9	3.65 (2.88–4.63)	59.46 (4.82–734.03)
Class II obesity	35.0–39.9	6.64 (5.24–8.43)	108.28 (8.77–1336.83)
Class III obesity	≥ 40.0	12.11 (9.55–15.36)	197.2 (15.97–2434.66)

BMI = body mass index, OSA = obstructive sleep apnea, SD = septal deviation.