Table 2. Correlations between aortic knob width and clinical variables.

Variables	Correlation coefficient	p value
Age	0.46	< 0.001
Male	0.08	0.064
BMI	0.21	< 0.001
Systolic BP	0.31	< 0.001
Smoker	0.01	0.865
Known CAD	0.09	0.027
Hemoglobin A1c	0.21	< 0.001
Total cholesterol	−0.02	0.669
Triglycerides	−0.01	0.906
CAVI	0.37	< 0.001
Antihypertensive drug	0.20	< 0.001
Antidiabetic drug	0.04	0.308
AHI	0.25	< 0.001
Arousal index	0.26	< 0.001
ODI (3%)	0.24	< 0.001
Lowest SpO2	−0.14	0.001

AHI, apnea–hypopnea index; BMI, body mass index; BP, blood pressure; CAD, coronary artery disease; CAVI, cardio–ankle vascular index; ODI, oxygen desaturation index; SpO₂, peripheral oxygen saturation.