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Article

Is the Association between Green Tea Consumption and the Number of Remaining Teeth Affected by Social Networks?: A Cross-Sectional Study from the Japan Gerontological Evaluation Study Project

1
Department of International and Community Oral Health, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan
2
Department of Disaster Medicine and Dental Sociology, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka 238-8580, Japan
3
Department of Community Health and Preventive Medicine, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan
4
Center of Preventive Medical Sciences, Chiba University, Chiba 260-0856, Japan
5
National Center for Geriatrics and Gerontology, Obu 474-8511, Japan
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2020, 17(6), 2052; https://doi.org/10.3390/ijerph17062052
Received: 9 March 2020 / Accepted: 16 March 2020 / Published: 20 March 2020
(This article belongs to the Special Issue Oral Health Inequalities in the World)
Consumption of green tea without sugar, as well as social networks, are associated with a lower risk of tooth loss. There is a possibility of confounding both factors because tea is often drunk with friends. Therefore, the present study aimed to examine whether green tea consumption is beneficially associated with the number of remaining teeth, while considering social networks. This cross-sectional study was based on the Japan Gerontological Evaluation Study (JAGES) in 2016. Self-administered questionnaires containing questions about green tea consumption were mailed to 34,567 community-dwelling residents aged ≥ 65 years. We used the number of remaining teeth as a dependent variable, and green tea consumption and the number of friends met over the past month (social network size) as independent variables. Linear regression models with multiple imputation were used. A total of 24,147 people responded (response rate = 69.9%), and 22,278 valid data were included into our analysis. Participants’ mean age was 74.2 years (standard deviation = 6.3), and 45.9% were men. Among the participants, 52.2% had ≥ 20 teeth, 34.2% drank 2–3 cups of green tea per day, and 32.6% met ≥ 10 people over the past month. After adjusting for all potential confounders, both higher green tea consumption and a larger social network size were associated with more remaining teeth (both p for trend < 0.001). The association of green tea was greater among those with smaller social networks (p for interaction < 0.05). The protective association of green tea was remarkable among people with smaller social networks. View Full-Text
Keywords: green tea; tooth loss; oral health; social network; friends green tea; tooth loss; oral health; social network; friends
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MDPI and ACS Style

Hoshi, M.; Aida, J.; Kusama, T.; Yamamoto, T.; Kiuchi, S.; Yamamoto, T.; Ojima, T.; Kondo, K.; Osaka, K. Is the Association between Green Tea Consumption and the Number of Remaining Teeth Affected by Social Networks?: A Cross-Sectional Study from the Japan Gerontological Evaluation Study Project. Int. J. Environ. Res. Public Health 2020, 17, 2052. https://doi.org/10.3390/ijerph17062052

AMA Style

Hoshi M, Aida J, Kusama T, Yamamoto T, Kiuchi S, Yamamoto T, Ojima T, Kondo K, Osaka K. Is the Association between Green Tea Consumption and the Number of Remaining Teeth Affected by Social Networks?: A Cross-Sectional Study from the Japan Gerontological Evaluation Study Project. International Journal of Environmental Research and Public Health. 2020; 17(6):2052. https://doi.org/10.3390/ijerph17062052

Chicago/Turabian Style

Hoshi, Manami, Jun Aida, Taro Kusama, Takafumi Yamamoto, Sakura Kiuchi, Tatsuo Yamamoto, Toshiyuki Ojima, Katsunori Kondo, and Ken Osaka. 2020. "Is the Association between Green Tea Consumption and the Number of Remaining Teeth Affected by Social Networks?: A Cross-Sectional Study from the Japan Gerontological Evaluation Study Project" International Journal of Environmental Research and Public Health 17, no. 6: 2052. https://doi.org/10.3390/ijerph17062052

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