Kiuchi Teppei, Asakura Keiko, Nakano Makiko, Omae Kazuyuki
Department of Preventive Medicine and Public Health, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
Department of Environmental and Occupational Health, School of Medicine, Toho University, Japan.
Prev Med Rep. 2017 Feb 16;6:121-125. doi: 10.1016/j.pmedr.2017.02.008. eCollection 2017 Jun.
Although bidet toilets are widely used in Japan, the relationship between habitual bidet toilet use and the incidence of hemorrhoids or urogenital infections has not been prospectively studied. We performed a web survey and followed bidet toilets users and non-users to assess the incidence of hemorrhoids or urogenital infections from 2013 to 2014. Study subjects were randomly selected from a research company's (Macromill, Inc.) web panel. The baseline survey inquired about toilet use and confounding parameters, and the follow-up survey examined outcome parameters. A total of 7637 subjects were analyzed using single or multiple logistic regression models. The prevalence odds ratios (ORs) between bidet toilet users and non-users for hemorrhoids, urological infections, and vulval pruritus were significantly > 1.0 but their incidence ORs were not significant. The adjusted incidence OR for bacterial vaginitis symptoms was significant (2.662, 95% confidence interval [CI] [1.315-5.520]). These findings suggest that positive relations between habitual bidet toilet use and hemorrhoids and urogenital symptoms, except bacterial vaginitis, were due to reverse causation. The incidence of bacterial vaginitis might be caused by bidet toilet use, but the incidence rates were too small to make a definite conclusion, and further studies are needed.
尽管坐浴盆马桶在日本广泛使用，但习惯性使用坐浴盆马桶与痔疮或泌尿生殖系统感染发病率之间的关系尚未进行前瞻性研究。我们进行了一项网络调查，并对坐浴盆马桶使用者和非使用者进行随访，以评估2013年至2014年期间痔疮或泌尿生殖系统感染的发病率。研究对象是从一家研究公司（Macromill, Inc.）的网络面板中随机选取的。基线调查询问了马桶使用情况和混杂参数，随访调查则检查了结果参数。使用单因素或多因素逻辑回归模型对总共7637名受试者进行了分析。坐浴盆马桶使用者与非使用者之间痔疮、泌尿系统感染和外阴瘙痒的患病率比值比（OR）显著>1.0，但它们的发病率OR并不显著。细菌性阴道炎症状的校正发病率OR显著（2.662，95%置信区间[CI][1.315 - 5.520]）。这些发现表明，习惯性使用坐浴盆马桶与痔疮以及除细菌性阴道炎外的泌尿生殖系统症状之间的正相关关系是由于反向因果关系。细菌性阴道炎的发病率可能是由使用坐浴盆马桶引起的，但发病率过小，无法得出明确结论，需要进一步研究。
