2017 -- Conference report inside the country
陳泓裕、吳晉祥、張尹凡、孫子傑、張智仁、盧豐華、楊宜青：台灣某族群茶類之飲用量與時間對於腎結石風險相關性之研究 台灣家庭醫學醫學會106年度學術研討會會刊 P141-142.
Hung-Yu Chen, Jin-Shang Wu, Yin-Fan Chang , Zih-Jie Sun, Chih-Jen Chang, Feng-Hwa Lu, Yi-Ching Yang: Increased Amount and Time of Tea Consumption Associated with a Decreased Risk of Renal Stone Diseases in a Taiwanese Population
Renal stone diseases are the presence or formation of concretions in the kidney. The prevalence of renal stone diseases rises higher during decades. Both genetic and environmental factors play roles in the process of urinary supersaturation. Among the environmental risk factors, diet is an important one. In many countries including Taiwan, tea is one commonly consumed beverage, secondly to water. Previous studies have looked into the association between tea consumption and renal stone diseases, but the results are still controversial. Besides, the impact of duration of tea consumption has not yet been investigated in the previous studies. Thus, the objective of this study was to examine tea consumption amount and duration of tea drinking in relation to risks of renal stone diseases.
After excluding individuals with a history of hyperuricemia or gout, findings of abdominal ultrasound showing transplant kidney, only one kidney, or gouty nephropathy, or missing data, a total of 13,842 adult participants were enrolled. Based on information of questionnaire, average tea consumption per day was calculated as the amount of tea consumption per day multiplied frequency of tea consumption per week and then divided by 7 days. Using the numbers of average tea consumption per day, we categorized the participants into three subgroups: 1) none of tea consumption; 2) tea consumption < 240ml per day; and 3) tea consumption ≥ 240 ml per day. In addition, we defined 120ml for each Chinese traditional teapot as a “ cup ” , and the cup of daily tea consumption was calculated as daily tea consumption divided by 120ml. By multiplying the daily cup and the years of tea consumption, we obtained the variable as“ cup-year ” . The diagnosis of renal stone diseases was established on the results of abdominal sonography.
Daily tea consumption amount was 119.2 ± 306.8 ml and 131.7 ± 347.3 ml in groups with and without renal stone diseases, but the difference was not statistically significant (p=0.19). Based on multiple logistic regression, daily tea drinking ≥240ml was inversely related to renal stone diseases (OR= 0.84, CI= 0.71-0.99, p=0.037) after adjusting age, gender, BMI, hypertension, diabetes, plasma creatinine and uric acid level, smoking, alcohol drinking, and regular exercise. When we changed the variables “ daily tea consumption amount ” into “ cup-year ” in the multiple logistic regression, the associated risk for renal stone diseases decreased significantly with tea consumption ≥20 cup-year (OR= 0.79, CI= 0.66-0.94, p=0.008), but not <20 cup-year (OR= 0.92, CI= 0.78-1.09, p=0.34).
Daily tea consumption ≥240ml was associated with a lower risk of renal stone diseases. When considering consumption amount and duration of tea drinking concomitantly, tea consumption ≥20 cup-year also had a decreased associated risk of renal stone diseases.