Green tea intake and risk of incident kidney stones: Prospective cohort studies in middle‐aged and elderly Chinese individuals

Objectives To investigate the association between green tea intake and incident stones in two large prospective cohorts. Methods We examined self‐reported incident kidney stone risk in the Shanghai Men's Health Study (n = 58 054; baseline age 40–74 years) and the Shanghai Women's Health St...

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Bibliographic Details
Published in:International journal of urology 2019-02, Vol.26 (2), p.241-246
Main Authors: Shu, Xiang, Cai, Hui, Xiang, Yong‐Bing, Li, Honglan, Lipworth, Loren, Miller, Nicole L, Zheng, Wei, Shu, Xiao‐Ou, Hsi, Ryan S
Format: Article
Language:English
Subjects:
Adult
Aged
Calculi
China - epidemiology
Cohort analysis
Confidence intervals
diet
Dietary intake
Feeding Behavior
Female
Follow-Up Studies
Geriatrics
Green tea
Health risk assessment
Humans
kidney calculi
Kidney Calculi - epidemiology
Kidney Calculi - prevention & control
Kidney stones
Kidneys
Male
Middle Aged
Nephrolithiasis
Oxalic acid
Proportional Hazards Models
Prospective Studies
Risk Factors
Self Report - statistics & numerical data
Sex Factors
Tea
Womens health
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Summary:Objectives To investigate the association between green tea intake and incident stones in two large prospective cohorts. Methods We examined self‐reported incident kidney stone risk in the Shanghai Men's Health Study (n = 58 054; baseline age 40–74 years) and the Shanghai Women's Health Study (n = 69 166; baseline age 40–70 years). Information on the stone history and tea intake was collected by in‐person surveys. Multivariable Cox proportional hazards models were adjusted for baseline demographic variables, medical history and dietary intakes including non‐tea oxalate from a validated food frequency questionnaire. Results During 319 211 and 696 950 person‐years of follow up, respectively, 1202 men and 1451 women reported incident stones. Approximately two‐thirds of men and one‐quarter of women were tea drinkers at baseline, of whom green tea was the primary type consumed (95% in men, 88% in women). Tea drinkers (men: hazard ratio 0.78, 95% confidence interval 0.69–0.88; women: hazard ratio 0.8, 95% confidence interval 0.77–0.98) and specifically green tea drinkers (men: hazard ratio 0.78, 95% confidence interval 0.69–0.88; women: hazard ratio 0.84, 95% confidence interval 0.74–0.95) had lower incident risk than never/former drinkers. Compared with never/former drinkers, a stronger dose–response trend was observed for the amount of dried tea leaf consumed/month by men (hazard ratiohighest category 0.67, 95% confidence interval 0.56–0.80, Ptrend 
ISSN:0919-8172
1442-2042
DOI:10.1111/iju.13849