RBP4 and atherosclerosis: Notably, serum lipocalin-2 and RBP4 levels were significantly higher in patients with subclinical atherosclerosis when compared to those in patients without [112.9 (86.4 to 202.1) μg/L versus 77.2(55.0–150.4) μg/L, 37.1(32.3–40.8) mg/L versus 23.2(20.1–29.2) mg/L, respectively; P = 0.002, P<0.001, respectively].