Association between retinol binding protein 4 and diabetic retinopathy among type 2 diabetic patients: a meta-analysis

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ORIGINAL ARTICLE

Association between retinol binding protein 4 and diabetic retinopathy among type 2 diabetic patients: a meta‑analysis Wentao Han1   · Huagen Wei1 · Weizheng Kong1 · Jing Wang1 · Luqian Yang1 · Huiqun Wu1 Received: 19 November 2019 / Accepted: 7 April 2020 © Springer-Verlag Italia S.r.l., part of Springer Nature 2020

Abstract Aims  The aim of this study was to investigate the association between retinol-binding protein 4 (RBP4) and diabetic retinopathy (DR) among patients with type 2 diabetes mellitus (T2DM). Methods  Databases PubMed, Embase, Web of Science, Chinese National Knowledge Infrastructure, VIP, and Wangfang were searched to July 30, 2019. The Newcastle–Ottawa Scale was applied to assess the quality of all identified studies, and those qualified were included in the meta-analysis. The Chi squared Q test and I2 statistics were conducted to evaluate heterogeneity. Standardized mean differences (SMD) and 95% confidence intervals (CI) among RBP4 within the DR and T2DM without retinopathy (DWR) groups were pooled using the random effects model depending on the heterogeneity. Subgroup analyses were conducted among the groups having different diabetes duration, detection methods, body mass index, and total cholesterol and triglyceride levels. The funnel plot was used to assess publication bias. Results  Nineteen observational studies were included in our meta-analysis. RBP4 was significantly higher in both nonproliferative DR (SMD: 0.72, 95% CI 0.48–0.95, P