RBP4 and coronary artery disorder: A previous meta-analysis by Hou et al. including 10 studies with 1698 Chinese subjects reported a significant difference in RBP4 levels between CAD and non-CAD participants under the random-effect model (weighted mean difference = 7.17 μg/ml, 95%CI:3.56–10.78 μg/ml, P<0.05) [16], which is inconsistent with the results of the present meta-analysis.