The correlation between reactive hyperemia index and endothelial dysfunction markers in patients with hypertension and obstructive sleep apnea syndrome: a cross-sectional study.

Although the P-values for other indicators such as height, age, and heart rate did not reach statistical significance, age was notably higher in the Grade 2 hypertension group (51.00 ± 6.97 years), suggesting a potential relationship between hypertension grade and age.

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