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The Negative Relationship between Bilirubin Level and Diabetic Retinopathy: A Meta-Analysis

Author

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  • Bo Zhu
  • Xiaomei Wu
  • Kang Ning
  • Feng Jiang
  • Lu Zhang

Abstract

Objectives: Findings on the relationship between total bilirubin level (TBL) and diabetic retinopathy (DR) are inconsistent. Thus, we carried out a meta-analysis to investigate the relationship between TBL and the risk of DR. Methods: Relevant studies were selected from six databases up to 31 May 2016 using a search strategy. The relevant data were extracted from the included studies according to the inclusion and exclusion criteria, and the mean value with standard errors or odds ratio (OR) with 95% confidence intervals (CIs) were calculated. We compared TBL in patients with DR with that in patients with diabetes but without retinopathy (NDR), and analyzed the dose-response relationship between TBL and the risk of DR. Results: Twenty-four studies were selected in this meta-analysis. Twenty studies were included to calculate the pooled SMD, and the results showed that TBL in the DR group was lower than that in the NDR group (SMD: –0.52, 95% CI: –0.67, –0.38). Nine studies were included to calculate the pooled ORs, and the results showed that there was a significant negative relationship between TBL and the risk of DR (OR: 0.19, 95% CI: 0.14, 0.25). Six studies were included to investigate the dose-response relationship between TBL and the risk of DR, and we found a nonlinear relationship between TBL and the risk of DR. The results of our meta-analysis were found to be reliable using subgroup and sensitivity analyses. Conclusions: The results of our meta-analysis indicate that higher TBL may be protective against DR in subjects with diabetes, and TBL could be used as a biomarker to predict the risk of DR.

Suggested Citation

  • Bo Zhu & Xiaomei Wu & Kang Ning & Feng Jiang & Lu Zhang, 2016. "The Negative Relationship between Bilirubin Level and Diabetic Retinopathy: A Meta-Analysis," PLOS ONE, Public Library of Science, vol. 11(8), pages 1-16, August.
    • Handle: RePEc:plo:pone00:0161649
    DOI: 10.1371/journal.pone.0161649
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    References listed on IDEAS

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    1. Bo Zhu & Xiaomei Wu & Xueyuan Zhi & Lei Liu & Quanmei Zheng & Guifan Sun, 2014. "Methylenetetrahydrofolate Reductase C677T Polymorphism and Type 2 Diabetes Mellitus in Chinese Population: A Meta-Analysis of 29 Case-Control Studies," PLOS ONE, Public Library of Science, vol. 9(7), pages 1-9, July.
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