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Meta-Analysis
. 2014 Sep 1:4:6251.
doi: 10.1038/srep06251.

Effect of green tea consumption on blood pressure: a meta-analysis of 13 randomized controlled trials

Xiaoli Peng  1 , Rui Zhou  2 , Bin Wang  3 , Xiaoping Yu  4 , Xiaohong Yang  4 , Kai Liu  3 , Mantian Mi  3
Affiliations
Meta-Analysis

Effect of green tea consumption on blood pressure: a meta-analysis of 13 randomized controlled trials

Xiaoli Peng et al. Sci Rep. .

Abstract

The studies investigating the effects of green tea on blood pressure (BP) have generated inconsistent results. The aim of this study is to quantitatively evaluate the effects of green tea on BP control. PubMed, Embase, and the Cochrane Library (updated to March 2014) were searched for randomized controlled trials evaluating the effects of green tea on BP. Pooled effect of green tea consumption on BP was evaluated using fixed-effects or random-effects model. Thirteen trials comprising a total of 1,367 subjects were included in the current meta-analysis. The overall outcome of the meta-analysis suggested that green tea consumption significantly decrease systolic blood pressure (SBP) level by -1.98 mmHg (95% CI: -2.94, -1.01 mmHg; P < 0.001). Compared with the control group, green tea also showed a significant lowering effect on diastolic blood pressure (DBP) in treatment group (-1.92 mmHg; 95% CI: -3.17, -0.68 mmHg; P = 0.002). Subgroup analyses further suggested that the positive effect of green tea polyphenols on BP was only showed in studies using a low-dose green tea polyphenol, with the long-term intervention duration or ruling out the confounding effects of caffeine. The meta-analysis suggested that green tea consumption had a favorable effect on decrease of BP.

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Figures

Figure 1
Figure 1. Flow diagram showing the number of citations retrieved by individual searches of articles included in the review.
Figure 2
Figure 2. Meta-analysis of effects of green tea on systolic blood pressure (SBP).
Weight was assigned with STATA (Version 11; StataCorp, College Station, TX) by using number of subjects and SD. Sizes of data markers indicate the weight of each study in this analysis. The diamond represents the overall estimated effect and the result was obtained from a fixed-effects model. WMD, weighted mean difference.
Figure 3
Figure 3. Meta-analysis of effects of green tea on diastolic blood pressure (DBP).
Weight was assigned with STATA (Version 11; StataCorp, College Station, TX) by using number of subjects and SD. Sizes of data markers indicate the weight of each study in this analysis. The diamond represents the overall estimated effect and the result was obtained from a random-effects model. WMD, weighted mean difference.
See this image and copyright information in PMC

References

    1. Laslett L. J. et al. The worldwide environment of cardiovascular disease: prevalence, diagnosis, therapy, and policy issues: a report from the American College of Cardiology. J Am Coll Cardiol. 60, S1–49 (2012). - PubMed
    1. Chiong J. R. Controlling hypertension from a public health perspective. Int J Cardiol. 127, 151–156 (2008). - PubMed
    1. Vasan R. S. et al. Residual lifetime risk for developing hypertension in middle-aged women and men: The Framingham Heart Study. JAMA. 287, 1003–1010 (2002). - PubMed
    1. James P. A. et al. 2014 evidence-based guideline for the management of high blood pressure in adults: report from the panel members appointed to the Eighth Joint National Committee (JNC 8). JAMA. 311, 507–520 (2014). - PubMed
    1. Lewington S., Clarke R., Qizilbash N., Peto R. & Collins R. Age-specific relevance of usual blood pressure to vascular mortality: a meta-analysis of individual data for one million adults in 61 prospective studies. Lancet 360, 1903–1913 (2002). - PubMed

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