Table 3.

Multivariate analysis of clinical and anthropomorphic variables as predictors of abnormal oximetry grouped by body mass index.

	Abnormal OXI		ODI ≥ 15		CT-90 ≥ 1.0
	(n = 295)		(n = 56)		(n = 193)
	OR (95% CI)	P-Value	OR (95% CI)	P-Value	OR (95% CI)	P-Value
WHR ≥1.0	5.3 (2.0–14.2)	<0.01	2.0 (1.0–3.9)	<0.05	2.1 (1.2–3.5)	<0.01
Age 50–54 yrs	1.3 (0.7–2.4)	0.50	1.4 (0.6–3.2)	0.49	1.3 (0.7–2.3)	0.37
Age ≥ 55 yrs	2.1 (1.2–3.9)	<0.05	1.9 (0.9–3.9)	0.08	1.8 (1.1–3.0)	<0.05
BMI ≥ 30 kg/m2	2.7 (1.6–4.7)	<0.01	1.5 (0.8–2.9)	0.21	1.7 (1.1–2.6)	<0.05
Diabetes	0.8 (0.3–2.6)	0.72	1.2 (0.5–2.8)	0.77	1.8 (0.8–4.0)	0.18
Hypertension	1.7 (0.9–3.2)	0.12	2.2 (1.1–4.1)	<0.05	1.3 (0.8–2.2)	0.24
Snoring	2.0 (1.1–3.7)	<0.05	2.3 (0.9–5.8)	0.08	1.0 (0.6–1.8)	0.89
Patients with BMI <29.9 (n = 198)
	Abnormal OXI		ODI ≥ 15		CT-90 ≥ 1.0
	(n = 127)		(n = 20)		(n = 80)
WHR ≥1.0	5.0 (1.1–23.7)	<0.05	2.9 (0.9–9.4)	0.09	2.3 (0.9–6.0)	0.10
Age 50–54 yrs	1.2 (0.6–2.7)	0.62	0.6 (0.1–2.9)	0.55	1.2 (0.5–2.7)	0.65
Age ≥ 55 yrs	1.7 (0.8–3.5)	0.15	1.4 (0.5–4.6)	0.55	1.9 (0.9–3.8)	0.08
Diabetes	0.7 (0.2–2.7)	0.56	1.1 (0.2–6.3)	0.93	1.7 (0.5–6.0)	0.44
Hypertension	1.7 (0.7–3.8)	0.22	1.9 (0.7–5.4)	0.25	1.7 (0.8–3.6)	0.14
Snoring	1.9 (0.9–4.2)	0.10	2.0 (0.4–9.8)	0.38	1.1 (0.5–2.5)	0.80
Patients with BMI ≥30.0 (n = 195)
	Abnormal OXI		ODI ≥15		CT-90 ≥ 1.0
	(n = 168)		(n = 36)		(n = 113)
WHR ≥1.0	5.6 (1.5–20.3)	<0.01	1.7 (0.8–3.8)	0.19	1.9 (1.0–3.6)	<0.05
Age 50–54 yrs	1.2 (0.4–3.9)	0.78	2.0 (0.7–5.9)	0.19	1.5 (0.7–3.5)	0.34
Age ≥ 55 yrs	3.9 (1.2–12.8)	<0.05	2.1 (0.8–5.3)	0.11	1.8 (0.9–3.5)	0.09
Diabetes	1.2 (0.1–10.8)	0.89	1.1 (0.4–3.3)	0.82	2.1 (0.7–6.3)	0.20
Hypertension	1.6 (0.5–4.6)	0.42	2.2 (1.0–5.1)	0.06	1.1 (0.5–2.0)	0.89
Snoring	2.3 (0.9–6.4)	0.10	2.4 (0.8–7.6)	0.14	1.0 (0.5–2.1)	0.95

BMI, body mass index; WHR, waist to hip ratio; OXI, ambulatory overnight oximetry; ODI, oxygen desaturation index; CT-90, percentage of recording time at oxygen saturation <90%.