Gao Tianjing, Han Siyue, Mo Guangju, Sun Qing, Zhang Min, Liu Huaqing
School of Public Health, Bengbu Medical College, Bengbu, China.
School of Health Management, Bengbu Medical College, Bengbu, China.
Front Nutr. 2022 Aug 15;9:916791. doi: 10.3389/fnut.2022.916791. eCollection 2022.
Vast accumulative evidence suggests that the consumption of tea and its components have various potential health benefits. This study used a longitudinal study to examine the causality between tea consumption and frailty in older Chinese people.
This study employed the longitudinal data from 2008 to 2014 of the Chinese Longitudinal Healthy Longevity Survey (CLHLS), which were systematically collected through face-to-face interviews. Two thousand four hundred and seventy three participants completed six-follow-up surveys in 2014 and were analyzed in this study. The frailty index recommended by Searle and co-authors, including 44 health deficits, was used. A Generalized Estimating Equation (GEE) was applied to determine the risk ratio (RR) with a 95% confidence interval (CI) for frailty, and further subgroup analyses were conducted to investigate whether the risk differed stratified by age, sex, and socioeconomic status. Additionally, the interaction between tea consumption with sex and frailty was tested.
Of the 2,473 participants, 14.1% were consistent daily tea drinkers, and 22.6% reported frailty at the 6-year follow-up. Compared to non-tea drinkers, consistent daily tea drinkers reported a significantly lower ratio of having frailty [risk ratio (RR) = 0.54, 95% confidence interval (CI): 0.38-0.78], adjusting for sociodemographic characteristics, health behavior, socioeconomic status, and chronic illnesses. In further subgroup analyses, consistent daily tea consumption significantly reduced the risk of frailty for males (RR = 0.53, 95% CI: 0.32-0.87) but not females (RR = 0.65, 95% CI: 0.37-1.12); in the young (RR = 0.40, 95% CI: 0.22-0.74) but not in the oldest (aged ≥ 80) (RR = 0.66, 95% CI: 0.40-1.06); informal education (RR = 0.48, 95% CI: 0.28-0.84) but not formal education (RR = 0.62, 95% CI: 0.37-1.03); financial dependence (RR = 0.42, 95% CI: 0.25-0.71) but not financial independence (RR = 0.71, 95% CI: 0.41-1.23). Additionally, females showed a lower tea-mediated risk of frailty in occasional tea consumers (RR = 0.51, 95% CI: 0.29-0.89) and inconsistent tea drinkers (RR = 0.58, 95% CI: 0.37-0.93).
Habitual tea consumption can reduce the risk of frailty in older Chinese, and the benefit varied by age, sex, education, and financial support.
大量累积证据表明，饮茶及其成分具有多种潜在的健康益处。本研究采用纵向研究方法，探讨中国老年人饮茶与衰弱之间的因果关系。
本研究使用了中国健康与养老追踪调查（CLHLS）2008年至2014年的纵向数据，这些数据通过面对面访谈系统收集。2014年，2473名参与者完成了六次随访调查，并纳入本研究进行分析。采用Searle及其合著者推荐的衰弱指数，该指数包括44项健康缺陷。应用广义估计方程（GEE）确定衰弱的风险比（RR）及95%置信区间（CI），并进一步进行亚组分析，以探讨按年龄、性别和社会经济地位分层后风险是否存在差异。此外，还测试了饮茶与性别和衰弱之间的相互作用。
在2473名参与者中，14.1%为每日持续饮茶者，22.6%在6年随访时报告有衰弱。与不饮茶者相比，在调整了社会人口学特征、健康行为、社会经济地位和慢性病因素后，每日持续饮茶者报告的衰弱比例显著较低[风险比（RR）=0.54，95%置信区间（CI）：0.38 - 0.78]。在进一步的亚组分析中，每日持续饮茶显著降低了男性的衰弱风险（RR = 0.53，95% CI：0.32 - 0.87），但对女性无此作用（RR = 0.65，95% CI：0.37 - 1.12）；对年轻人有作用（RR = 0.40，95% CI：0.22 - 0.74），但对年龄最大的（≥80岁）人群无作用（RR = 0.66，95% CI：0.40 - 1.06）；对未受过正规教育者有作用（RR = 0.48，95% CI：0.28 - 0.84），但对受过正规教育者无作用（RR = 0.62，95% CI：0.37 - 1.03）；对经济依赖者有作用（RR = 0.42，95% CI：0.25 - 0.71），但对经济独立者无作用（RR = 0.71，95% CI：0.41 - 1.23）。此外，女性在偶尔饮茶者（RR = 0.51，95% CI：0.29 - 0.89）和非持续饮茶者中，饮茶介导的衰弱风险较低（RR = 0.58，95% CI：0.37 - 0.93）。
习惯性饮茶可降低中国老年人的衰弱风险，且这种益处因年龄、性别、教育程度和经济支持情况而异。
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