RBP4 and chronic kidney disease: Table 4 depicts the results of subgroup analyses, which suggested that there are no significant modifying effects of age (Pinteraction = 0.758), sex (Pinteraction = 0.180), BMI (Pinteraction = 0.749), smoking (Pinteraction = 0.708), hypertension (Pinteraction = 0.893), diabetes mellitus (Pinteraction = 0.625), and CKD (Pinteraction = 0.490) for the association between RBP4 and MACEs in patients with stable CAD.