A cross-sectional epidemiological study of the relationship between sleep duration, quality, and rhythm and presenteeism in workers.

This study aims to examine the relationship of sleep (sleep duration, sleep quality, and sleep rhythm) with presenteeism in workers while controlling for other confounding factors. A total of 2375 workers of six Japanese companies received self-administered questionnaires from June to November 2018. Information on sleep duration was used to evaluate sleep quantity, the Athens Insomnia Scale (AIS) was used to evaluate sleep quality, and workers' engagement in shift work was used to determine their sleep rhythms.

A Nationwide Cohort Study of Parasomnias Among Adolescents.

To elucidate the incidence rates and predictive factors for parasomnias (disorders of arousal, nightmare, and sleep paralysis) in adolescents. This was a prospective cohort study of high school students. In 2010, we conducted a baseline survey of first-year students enrolled in randomly selected Japanese schools (10 junior high schools and 14 senior high schools); 2 years later, a follow-up survey of the same participants was conducted.

A nationwide cross-sectional study of difficulty waking up for school among adolescents.

Study Objectives: To determine the prevalence of and risk-factors for difficulty waking up for school among adolescents.

Methods: We used a self-administered questionnaire (140 junior high schools [JHSs]; 124 senior high schools [SHSs]) selected randomly in 2012 from throughout Japan.

Results: Total response rate: 60.

Psychometric Properties of a New Simplified Scale to Assess the Quality of Workers' Rest and Recreation on Their Days Off.

Background: In this study, we developed and tested the validity and reliability of the 12-item Rest and Recreation Quality Scale (RRQ-Scale) for Workers as a new scale capable of conveniently assessing the quality of workers' days off, that is, their rest and recreation.

Methods: Participants included 756 employees (694 men, 62 women, mean age ± SD= 44.7 ± 13.

Factors Associated with the Development of Childhood Asthma in Japan: A Nationwide Longitudinal Study.

Introduction: Many environmental factors are related to the development of asthma. However, the key factors of childhood asthma onset have not been sufficiently elucidated. Further, low-weight births have increased in Japan.

Longitudinal Epidemiologic Study of Poor Mental Health Status in Japanese Adolescents: Incidence of Predictive Lifestyle Factors.

Objective: To clarify the incidence of predictive risk factors for poor mental health status in Japanese adolescents.

Methods: In 2010, baseline surveys of first-year junior and senior high school students were conducted at 10 randomly selected junior high schools and 14 senior high schools in Japan. After 2 years, follow-up surveys were conducted on the same students.

The association between sleep disturbance and second-hand smoke exposure: a large-scale, nationwide, cross-sectional study of adolescents in Japan.

Objective: This study investigated the association between secondhand-smoke (SHS) exposure and sleep disturbance symptoms.

Methods: This study was a cross-sectional survey of junior and senior high school students throughout Japan. A total of 85,931 adolescents responded, and 84,988 questionnaires were included in the analysis.

Risk Factors at Birth Predictive of Subsequent Injury Among Japanese Preschool Children: A Nationwide 5-Year Cohort Study.

Objective: To identify risk factors at birth that are predictive of subsequent injury among preschool children.

Methods: Retrospective analysis of population-based birth cohort data from the "Longitudinal Survey of Babies Born in the 21st Century" was performed from 2001 through 2007 in Japan (n = 47,015). The cumulative incidence and the total number of hospitalizations or examinations conducted at medical facilities for injury among children from birth up to the age of 5 years were calculated.

Factors Related to Alcohol Consumption Among Japanese Physicians.

This study aimed to investigate the drinking habits of Japanese physicians, and clarify their causal factors. A self-administered questionnaire was sent to 6000 male and 1500 female physicians, selected from among members of the Japan Medical Association. We analyzed the correlation of drinking habits with age, medical department, smoking and exercise status, work environment, sleep problems, and mental health.

Short sleep duration, shift work, and actual days taken off work are predictive life-style risk factors for new-onset metabolic syndrome: a seven-year cohort study of 40,000 male workers.

Background: This longitudinal study investigated the effects of various lifestyle-related factors - including sleep duration, shift work, and actual days taken off work - on new-onset metabolic syndrome (MetS).

Methods And Results: A total of 39,182 male employees (mean age 42.4 ± 9.

Relationship between stress coping and sleep disorders among the general Japanese population: a nationwide representative survey.

Objective: To clarify the prevalence of stress, and examine the relationship between sleep disorders and stress coping strategies among highly stressed individuals in the general Japanese population.

Methods: A cross-sectional nationwide survey was undertaken in November 2007. Men and women were randomly selected from 300 districts throughout Japan.

The association between alcohol use and problematic internet use: A large-scale nationwide cross-sectional study of adolescents in Japan.

Background: This study aimed to clarify the associations between the frequency and amount of alcohol consumption and problematic Internet use, such as Internet addiction and excessive Internet use.

Methods: A self-administered questionnaire survey was administered to students enrolled in randomly selected junior and senior high schools throughout Japan, and responses from 100,050 students (51,587 males and 48,463 females) were obtained. Multiple logistic regression analyses were performed in order to examine the associations between alcohol use and problematic Internet, use such as Internet addiction (Young Diagnostic Questionnaire for Internet Addiction ≥5) and excessive Internet use (≥5 h/day).

Nationwide epidemiological study of insomnia in Japan.

Background: This study was a nationwide epidemiological study of insomnia in Japan. It was conducted because very few studies on this topic have previously been performed for the general Japanese population.

Methods: An interview survey on symptoms of insomnia (difficulty initiating sleep, difficulty maintaining sleep with difficulty resuming sleep, and early morning awakening with difficulty resuming sleep) and daytime dysfunction was conducted on the general nationwide population in the winter (February) and summer (August) of 2008.

Association Between Smoking and Problematic Internet Use Among Japanese Adolescents: Large-Scale Nationwide Epidemiological Study.

The aim of this study was to clarify the association between smoking and problematic Internet use (PIU), such as Internet addiction (IA) and excessive Internet use (EIU), among Japanese adolescents. A self-administered questionnaire was administered to students enrolled in randomly selected junior and senior high schools throughout Japan. Responses were obtained from 100,050 students (0.

Anger and Impulsivity Among Japanese Adolescents: A Nationwide Representative Survey.

Objective: This study aimed to clarify the prevalence of anger and impulsivity and its associated factors through a nationwide survey of junior and senior high school adolescent students in Japan.

Methods: A self-administered questionnaire covering (1) personal data, (2) lifestyle, (3) mental health status, and (4) feelings of anger and impulsivity was distributed to junior and senior high school students in Japan. Among the total of 10,955 junior high schools and 5,115 senior high schools nationwide, 130 and 110 were randomly selected, respectively.

Factors affecting unhappiness at school among Japanese adolescents: an epidemiological study.

Background: Unhappiness at school is one of the main reasons for truancy among adolescents. In order to assess this problem more thoroughly in the context of Japanese adolescents, the present study examined the associations between feelings of unhappiness at school and lifestyle habits, school life realities, and mental health status.

Method: This study was designed as a cross-sectional survey.