CD34 and Hypertension: With the lowest quartile of circulating CD34-positive cell count (Q1) as the referent group, the fully adjusted OR and 95% CI of active arterial wall thickening was 2.69 (1.22, 5.95) for the second lowest quartile (Q2), 2.98 (1.35, 6.56) for the second highest quartile (Q3), and 3.01 (1.31, 6.94) for the highest quartile (Q4) among men without hypertension.