Table 3– Correlations between clinical variables, respiratory events oxidative stress markers and ischaemic reactive hyperaemia (IRH)

Variable	IRH ρ-value	p-value
Age yrs	-0.068	0.579
BMI kg·m⁻²	-0.076	0.537
Sex	0.053	0.913
AHI events·h⁻¹	0.542	0.001
ODI events·h⁻¹	-0.565	0.001
T90 %	-0.480	0.001
Minimum S_p,O₂ %	0.311	0.051
Mean S_p,O₂ %	0.426	0.002
Waking S_p,O₂ %	0.193	0.126
Arousals events·h⁻¹	-0.189	0.209
Total cholesterol mg·dL⁻¹	0.088	0.689
HDL cholesterol mg·dL⁻¹	-0.203	0.352
Triglycerides mg·dL⁻¹	0.209	0.315
Malondialdehyde μM	-0.371	0.002
8-hydroxydeoxyguanosine ng·mL⁻¹	-0.271	0.025
Protein carbonyls nmol·mg protein⁻¹	0.163	0.180
SBP mmHg	-0.117	0.355
DBP mmHg	-0.243	0.051

BMI: body mass index; AHI: apnoea–hypopnoea index; ODI: oxygen desaturation index; T90: sleep time spent with arterial oxygen saturation measured by pulse oximetry (S_p,O₂) <90%; HDL: high-density lipoprotein; SBP: systolic blood pressure; DBP: diastolic blood pressure.