Sexual Behaviors among Individuals Aged 20-49 in Japan: Initial Findings from a Quasi-Representative National Survey, 2022

Ghaznavi, Cyrus; Ueda, Peter; Okuhama, Ayako; Sakamoto, Haruka

doi:10.1080/00224499.2023.2178614

Cited by 5 publications

(17 citation statements)

References 47 publications

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“…To assess the plausibility of the assumption that the sexual partnership distribution in all considered countries follows the empirical data from the UK (Natsal), we compared the Natsal’s 1-year distribution with that from the National Inventory of Japanese Sexual Behavior (NInJaS) collected in Japan. 7…”

Section: Supplementary Resultsmentioning

confidence: 99%

“…In addition, we used the National Inventory of Japanese Sexual Behavior (NInJaS) data 7 to assess the plausibility of our assumption that the sexual partnership distribution in Asia follows the UK Natsal dataset (see Figure S11). The Regional Ethics Committee at the University of Tokyo, Japan approved the study (ref: 2019305NI-(2)).…”

Section: Methodsmentioning

confidence: 99%

“…All the data used in this study is publicly available, except for the NInJaS study under an ethics-associated restriction on data sharing (see the original study 7 for details).…”

Section: Methodsmentioning

confidence: 99%

“…We used the reported 4-week partner numbers from the British National Surveys of Sexual Attitudes and Lifestyles (Natsal) to parameterise the distribution of sexual activity levels among MSM populations in Asia, given the scarcity of similar datasets in this region. As an assessment of generalisability, we compared Natsal data against the National Inventory of Japanese Sexual Behavior (NInJaS) data 6 in Supplementary materials . Mpox importations between countries were modelled based on the 2019 travel volume data from the United Nations World Tourism Organization (UNWTO).…”

Section: Main Textmentioning

confidence: 99%

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Projecting international mpox spread in Asia: ongoing global health risk

Asakura,

Jung,

Murayama

et al. 2024

Preprint

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The global mpox outbreak affected many Asian countries in 2023, following a sustained local transmission in Japan. Given the large population sizes and limited vaccine rollout in Asia, the potential risk of global mpox reemergence arising from Asia is of concern. Using a mathematical model incorporating heterogeneous sexual networks among MSM, calibrated to incidence data in Japan, we projected the patterns of international mpox spread across 42 Asian countries. Our simulations highlight countries at a high risk of mpox introductions, many of which were low- and middle-income countries (LMICs) in South-eastern Asia. Our analysis also suggests a shifting focus of importation risk from Eastern Asia to South-eastern Asia, and subsequently to Central, Southern and Western Asia, which roughly coincided with the observed spread patterns in 2023. Global cooperation and support are warranted, especially for LMICs with an elevated risk of mpox introduction, to minimise the risk of continued circulation in Asia and beyond.

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Section: Supplementary Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…All the data used in this study is publicly available, except for the NInJaS study under an ethics-associated restriction on data sharing (see the original study 7 for details).…”

Section: Methodsmentioning

confidence: 99%

Section: Main Textmentioning

confidence: 99%

See 2 more Smart Citations

Projecting international mpox spread in Asia: ongoing global health risk

Asakura,

Jung,

Murayama

et al. 2024

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Positive effects of vaccination on screening behavior and a recent increase in cervical cancer screening rates among young Japanese women have been reported 16–18 . Furthermore, low sexual activity among young populations have been observed in Japan 19,20 . In a recent online survey, 29.7% of Japanese women aged 20–29 years had never experienced sexual intercourse 19 .…”

Section: Discussionmentioning

confidence: 99%

Human papillomavirus vaccine impact on invasive cervical cancer in Japan: Preliminary results from cancer statistics and the MINT study

Onuki,

Takahashi,

Iwata

et al. 2023

Cancer Science

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The first prophylactic vaccine against human papillomavirus (HPV) 16 and HPV18 was licensed in Japan in 2009. HPV vaccine effectiveness against high‐grade cervical lesions has been demonstrated among young Japanese women, but evidence of its effects on invasive cervical cancer (ICC) is lacking. Using data from two different cancer registries, we compared recent trends of new ICC cases by age group using Poisson regression analysis. We also analyzed time trends in HPV16/18 prevalence among 1414 Japanese women aged <40 years newly diagnosed with ICC in the past decade. Based on the population‐based cancer registry, the incidence of ICC among young women aged 20–29 years showed a significant decline from 3.6 to 2.8 per 100 000 women‐years during 2016–2019, but no similar decline was observed for older age groups (p < 0.01). Similarly, using data from the gynecological cancer registry of the Japan Society of Obstetrics and Gynecology, the annual number of ICCs among women aged 20–29 years also decreased from 256 cases to 135 cases during 2011–2020 (p < 0.0001). Furthermore, a declining trend in HPV16/18 prevalence in ICC was observed only among women aged 20–29 years during 2017–2022 (90.5%–64.7%, p = 0.05; Cochran–Armitage trend test). This is the first report to suggest population‐level effects of HPV vaccination on ICC in Japan. Although the declining trend in HPV16/18 prevalence among young women with ICC supports a causal linkage between vaccination and results from cancer registries, further studies are warranted to confirm that our findings are attributable to vaccination.

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Association between sex hormones and erectile dysfunction in men without hypoandrogenism

Fujita,

Okamoto,

Yamamoto

et al. 2024

Sci Rep

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In addition to testosterone, various endocrine hormones, such as dehydroepiandrosterone sulfate (DHEA-S) and estradiol, may be involved in erectile function. However, the role of these sex hormones in the erectile function of men without hypoandrogenism remains unclear. This cross-sectional study included 398 community-dwelling men without hypoandrogenism. The participants were categorized into the non-ED and ED groups. Multivariable logistic regression analyses were performed to investigate the relationship between ED and serum sex hormone levels, including total testosterone, DHEA-S, estradiol, luteinizing hormone (LH), follicle-stimulating hormone (FSH), and prolactin. Among the 398 men, 66 (17%) and 332 (83%) were categorized into the non-ED and ED groups, respectively. In the multivariable analyses, serum DHEA-S and estradiol levels were significantly associated with ED (odds ratio [OR]: 0.996, P = 0.030; OR: 1.082, P = 0.002; respectively), whereas serum total testosterone, LH, FSH, and prolactin levels did not demonstrate significant association. After adjusting for age, none of neutrophil-to-lymphocyte ratio, serum plasminogen activator inhibitor-1 levels, and skin advanced glycation end-products levels demonstrated significant correlation with serum DHEA-S and estradiol levels. In conclusion, lower testosterone levels did not affect ED in men with normal testosterone levels, whereas serum DHEA-S and estradiol levels were significantly associated with ED.

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Sexual Behaviors among Individuals Aged 20-49 in Japan: Initial Findings from a Quasi-Representative National Survey, 2022

Cited by 5 publications

References 47 publications

Projecting international mpox spread in Asia: ongoing global health risk

Projecting international mpox spread in Asia: ongoing global health risk

Human papillomavirus vaccine impact on invasive cervical cancer in Japan: Preliminary results from cancer statistics and the MINT study

Association between sex hormones and erectile dysfunction in men without hypoandrogenism

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