Association between Daily Tea Consumption and Retinal Vascular Caliber
Xueping Zhang1, Yin Hu2, Na Liu1, Keming Wang2, Mingguang He2
1Department of Ophthalmology, Guangzhou No.11 People's Hospital, Guangzhou 510000, China; 2The State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, China
Abstract:Objective:To assess the association between daily tea consumption and retinal vascular caliber in Chinese people. Methods:In this cross-sectional study, 4 430 subjects aged 40 years or older without a history of cardiovascular events were enrolled. Standard retinal photos and a validated computer-based program were used to measure retinal vascular caliber. A self-report questionnaire was administrated to obtain data regarding tea consumption and other socio-demographic information. Daily tea consumption was quantified into five dose categories (never, occasionally, <1 cup/day, 1-2 cups/day and >2 cups/day) and three common tea types (green, oolong and black/Pu'er tea, according to the degree of fermentation). Multivariate linear regression models were adopted to assess the cross-sectional association of tea consumption with retinal vascular caliber. Results:The age of the study participants was 58.8±9.9 years. Among them, 775 (17.49%) never consumed tea and, 645 (14.56%), 1 240 (27.99%) and 1 770 (39.95%) were accustomed to green, oolong and black/Pu'er tea, respectively. Retinal vascular calibers were not associated with doses of tea consumption after adjusting for lifestyle factors and other cardiovascular confounders, whether analyzed in all participants or in subpopulations accustomed to distinct tea types (all P>0.05). Conclusions:There is no significant association between daily tea consumption and retinal vascular caliber in a Chinese population.
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