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Abstract Title:

Effects of Green Tea Gargling on the Prevention of Influenza Infection: An Analysis Using Bayesian Approaches.

Abstract Source:

J Altern Complement Med. 2017 Feb ;23(2):116-120. Epub 2016 Sep 14. PMID: 27627647

Abstract Author(s):

Kazuki Ide, Yohei Kawasaki, Maiko Akutagawa, Hiroshi Yamada

Article Affiliation:

Kazuki Ide

Abstract:

OBJECTIVES: The aim of this study is to analyze the data obtained from a randomized trial on the prevention of influenza by gargling with green tea, which gave nonsignificant results based on frequentist approaches, by using Bayesian approaches.

METHODS: The posterior proportion, with 95% credible interval (CrI), of influenza in each group was calculated. The Bayesian indexθ is the probability that a hypothesis is true. In this case, θ is the probability that the hypothesis that green tea gargling reduced influenza compared with water gargling is true. Univariate and multivariate logistic regression analyses were also performed by using the Markov chain Monte Carlomethod.

RESULTS: The full analysis set included 747 participants. During the study period, influenza occurred in 44 participants (5.9%). The difference between the two independent binominal proportions was -0.019 (95% CrI, -0.054 to 0.015;θ = 0.87). The partial regression coefficients in the univariate analysis were -0.35 (95% CrI, -1.00 to 0.24) with use of a uniform prior and -0.34 (95% CrI, -0.96 to 0.27) with use of a Jeffreys prior. In the multivariate analysis, the values were -0.37 (95% CrI, -0.96 to 0.30) and -0.36 (95%CrI, -1.03 to 0.21), respectively.

CONCLUSIONS: The difference between the two independent binominal proportions was less than 0, andθ was greater than 0.85. Therefore, green tea gargling may slightly reduce influenza compared with water gargling. This analysis suggests that green tea gargling can be an additional preventive measure for use with other pharmaceutical and nonpharmaceutical measures and indicates the need for additional studies to confirm the effect of green tea gargling.

Study Type : Human Study
Additional Links
Pharmacological Actions : Prophylactic Agents : CK(129) : AC(31)

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Sayer Ji
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