Table 3– Correlations between plasma lipid levels and markers of obstructive sleep apnoea severity

	AHI events·h⁻¹		ODI events·h⁻¹		S_pO₂ <90% min		Arousal index events·h⁻¹
	R	p-value	R	p-value	R	p-value	R	p-value
Cholesterol mmol·L⁻¹	0.074	0.097	0.041	0.356	0.030	0.499	0.055	0.216
LDL cholesterol mmol·L⁻¹	0.002	0.966	0.023	0.607	0.005	0.909	0.038	0.400
HDL cholesterol mmol·L⁻¹	-0.222	<0.001	-0.224	<0.001	0.163	<0.001	-0.190	<0.001
Triglycerides mmol·L⁻¹	0.292	<0.001	0.270	<0.001	0.158	<0.001	0.277	<0.001
ApoA-1 g·L⁻¹	0.072	0.131	0.096	0.045	0.062	0.195	0.028	0.560
ApoB g·L⁻¹	0.180	<0.001	0.160	0.001	0.117	0.014	0.145	0.002

AHI: apnoea/hypopnoea index; ODI: oxygen desaturation index; S_pO₂: arterial oxygen saturation measured by pulse oximetry; LDL: low-density lipoprotein; HDL: high-density lipoprotein; Apo: apolipoprotein.