Dataset Information

Trends in heterosexual inexperience among young adults in Japan: analysis of national surveys, 1987-2015.

ABSTRACT:

Background

It has been suggested that an increasing number of Japanese adults remain sexually inexperienced; however, no study has assessed this issue using nationally representative data.

Methods

We used data from seven rounds of the National Fertility Survey of Japan, 1987-2015, and included adults aged 18-39?years (18-34?years in the 1987 survey) in the analyses (sample size 11,553-17,850 [1987-2010]; response rate 70.0-92.5%). For each survey year, sex and age group, we estimated the age-adjusted prevalence of heterosexual inexperience, defined as reporting no experience of sexual intercourse with someone of the opposite sex. We used logistic regression, adjusted for age, to identify factors associated with heterosexual inexperience in the 2010 survey. Information about same-sex sexual experience was not available.

Results

Between 1992 and 2015, the age-standardized prevalence of heterosexual inexperience in adults aged 18-39?years increased from 21.7 to 24.6% for women (p-values for linear and quadratic trend ConclusionsThe proportion of young Japanese adults with no experience of heterosexual intercourse had increased in the past two decades. Among adults in their thirties, around one in ten had no heterosexual experience. Unemployment, temporary/part-time employment and low income were associated with heterosexual inexperience among men. Further research is needed on the factors contributing to and the potential public health and demographic implications of the high proportion of the Japanese population that remains sexually inexperienced well into adult age.

SUBMITTER: Ghaznavi C

PROVIDER: S-EPMC6452514 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Publications

Trends in heterosexual inexperience among young adults in Japan: analysis of national surveys, 1987-2015.

Ghaznavi Cyrus C Sakamoto Haruka H Yoneoka Daisuke D Nomura Shuhei S Shibuya Kenji K Ueda Peter P

BMC public health 20190408 1

<h4>Background</h4>It has been suggested that an increasing number of Japanese adults remain sexually inexperienced; however, no study has assessed this issue using nationally representative data.<h4>Methods</h4>We used data from seven rounds of the National Fertility Survey of Japan, 1987-2015, and included adults aged 18-39 years (18-34 years in the 1987 survey) in the analyses (sample size 11,553-17,850 [1987-2010]; response rate 70.0-92.5%). For each survey year, sex and age group, we estima ...[more]

PMID: 30955502

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Project description:ImportancePrevious studies have demonstrated that adolescents and young adults (AYAs) with cancer are a distinct cancer population; however, research on long-term epidemiological trends and characteristics of cancers in AYAs is lacking.ObjectiveTo characterize the epidemiology of cancer in AYAs aged 15 to 39 years with respect to (1) patient demographic characteristics, (2) frequencies of cancer types, and (3) cancer incidence trends over time.Design, setting, and participantsThis retrospective, serial cross-sectional, population-based study used registry data from the Surveillance, Epidemiology, and End Results (SEER) database from January 1, 1973, to December 31, 2015 (SEER 9 and SEER 18). The study population was from geographically distinct US regions, chosen to represent the racial and ethnic heterogeneity of the country. Initial analyses were performed from January 1 to August 31, 2019.Main outcomes and measuresIncidence rates and descriptive epidemiological statistics for patients aged 15 to 39 years with invasive cancer.ResultsA total of 497 452 AYAs diagnosed from 1973 to 2015 were included in this study, with 293 848 (59.1%) female and 397 295 (79.9%) White participants. As AYAs aged, an increase in the relative incidence of carcinomas and decrease in the relative incidence of leukemias, lymphomas, germ cell and trophoblastic neoplasms, and neoplasms of the central nervous system occurred. Among the female AYAs, 72 564 (24.7%) were diagnosed with breast carcinoma; 48 865 (16.6%), thyroid carcinoma; and 33 828 (11.5%), cervix and uterus carcinoma. Among the male AYAs, 37 597 (18.5%) were diagnosed with testicular cancer; 20 850 (10.2%), melanoma; and 19 532 (9.6%), non-Hodgkin lymphoma. The rate of cancer in AYAs increased by 29.6% from 1973 to 2015, with a mean annual percentage change (APC) per 100 000 persons of 0.537 (95% CI, 0.426-0.648; P < .001). Kidney carcinoma increased at the greatest rate for both male (APC, 3.572; 95% CI, 3.049-4.097; P < .001) and female (APC, 3.632; 95% CI, 3.105-4.162; P < .001) AYAs.Conclusions and relevanceIn this cross-sectional, US population-based study, cancer in AYAs was shown to have a unique epidemiological pattern and is a growing health concern, with many cancer subtypes having increased in incidence from 1973 to 2015. Continued research on AYA cancers is important to understanding and addressing the distinct health concerns of this population.

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Project description:BackgroundAmong high-income countries, Japan has a low prevalence of obesity, but little is understood about subnational trends and variations in body mass index (BMI), largely owing to the lack of data from representative samples of prefectures. We aimed to examine long-term trends and distributions of adult BMI at the prefecture level in Japan from the late 1970s using a spatiotemporal model.MethodsWe obtained cross-sectional data for 233,988 men and 261,086 women aged 20-79 years from the 44 annual National Health and Nutrition Surveys (NHNS) conducted during 1975-2018. We applied a Bayesian spatiotemporal model to estimate the annual time series of age-standardized and age-specific mean BMI by 20-year age group and sex for each of the 47 prefectures. We assessed socioeconomic inequalities in BMI across prefectures using the concentration index, according to population density.ResultsIn men, the age-standardized prefectural mean BMI ranged from 21.7 kg/m2 (95% credible interval, 21.6-21.9) to 23.1 kg/m2 (22.9-23.4) in 1975 and from 23.5 kg/m2 (23.3-23.7) to 24.8 kg/m2 (24.6-25.1) in 2018. In women, the age-standardized prefectural mean BMI ranged from 22.0 kg/m2 (21.9-22.2) to 23.4 kg/m2 (23.2-23.6) in 1975 and from 21.7 kg/m2 (21.6-22.0) to 23.5 kg/m2 (23.2-23.8) in 2018. Mean BMI was highest in the southernmost prefecture for most of the study period, followed by northeast prefectures. The increase in mean BMI was largest in southwest prefectures, which caught up with northeast prefectures over time. The concentration index was negative, indicating higher BMI in less-populated prefectures. Absolute values of the concentration index were greater in women than in men and increased over time.ConclusionsThere were variations in adult mean BMI across prefectures, and geographic distributions changed over time. Further national and local efforts are needed to address the rising trend in mean BMI, particularly among men in rural prefectures, and socioeconomic inequalities among women. Bayesian hierarchical modeling is useful for reconstructing long-term spatiotemporal trends of mean BMI by integrating small-sized survey samples at the prefecture level in the NHNS.

Dataset Information

Trends in heterosexual inexperience among young adults in Japan: analysis of national surveys, 1987-2015.

Background

Methods

Results

Publications

Trends in heterosexual inexperience among young adults in Japan: analysis of national surveys, 1987-2015.

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