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Journal of Diabetes Research
Volume 2015 (2015), Article ID 231570, 7 pages
http://dx.doi.org/10.1155/2015/231570
Research Article

Regular Chinese Green Tea Consumption Is Protective for Diabetic Retinopathy: A Clinic-Based Case-Control Study

1Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Diseases, School of Public Health, Medical College of Soochow University, Suzhou 215123, China
2The 3rd People’s Hospital of Xiangcheng District, Suzhou 215134, China
3School of Radiation Medicine and Protection, Medical College of Soochow University, Suzhou 215123, China
4Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Suzhou 215123, China

Received 21 October 2014; Revised 20 January 2015; Accepted 8 February 2015

Academic Editor: Gareth McKay

Copyright © 2015 Qinghua Ma et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective. To determine the association between regular Chinese green tea consumption and the risk of diabetic retinopathy (DR) in diabetic patients in China. Methods. 100 DR patients and 100 age-sex-matched diabetic controls without retinopathy were recruited in a clinic-based, case-control study. DR was defined from retinal photographs and detailed information on Chinese green tea consumption of the participants was collected through a face-to-face interview. Results. The crude odds ratio [OR] of Chinese green tea consumption for DR was 0.49 (95% confidence interval: 0.26–0.90). When stratified by sex, the protective effect of Chinese green tea consumption on DR was statistically significant in women () but not in men (). After adjusting for age, sex, and other confounders, DR was significantly associated with Chinese green tea consumption (OR = 0.48; ), higher systolic blood pressure (OR = 1.02; ), longer duration of diabetes (OR = 1.07; ), and the presence of family history of diabetes (OR = 2.35; ). Conclusions. Diabetic patients who had regularly drunk Chinese green tea every week for at least one year in their lives had a DR risk reduction of about 50% compared with those who had not. Regular Chinese green tea consumption may be a novel approach for the prevention of DR.