Yoshitaka Kaneita

Oita University, Ōita, Ōita, Japan

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Publications (89)184.46 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: No nationally representative survey of irritable bowel syndrome (IBS) among adolescents has ever been performed in Japan. In the present study, we aimed to clarify the prevalence of IBS among Japanese adolescents and the factors associated with it. The items related to the diagnostic criteria for IBS based on the Rome III Diagnostic Criteria for Functional Gastrointestinal Disorders was included in a cross-sectional nationwide survey of 'alcohol consumption and smoking habits among junior and senior high school students'. The participating schools were sampled from among all junior and senior high schools in Japan using the cluster sampling method, and self-administered questionnaires were sent to the selected schools by mail. Among 99,416 questionnaires that were collected, data from 98,411 valid responses were analyzed. The results showed that the prevalence of IBS was 18.6%. Although no sex difference was observed in the overall prevalence of IBS, the prevalence of diarrhea-predominant IBS was higher among boys than among girls, and the prevalence of constipation-predominant IBS was higher among girls than among boys. The prevalence of IBS increased with progression of the school grade, and there were the significant relationships between IBS and sleep-phase delay and insomnia symptoms. IBS was also significantly associated with poor mental health status. These results indicate that IBS is common among junior and senior high school students, and associated with lifestyle and mental health. This article is protected by copyright. All rights reserved.
    Journal of Gastroenterology and Hepatology 04/2015; DOI:10.1111/jgh.12974 · 3.63 Impact Factor
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    ABSTRACT: This study sought to clarify the prevalence and associated factors of subjective fatigue symptoms, by analyzing epidemiological data for a sample of the Japanese population. Data from 1224 individuals (539 men and 685 women) aged ≥20 years were subsequently analyzed. Prevalence of fatigability was 17.2% (n = 211) and that of residual fatigue was 13.6% (n = 167), with women showing significantly higher prevalence of both symptoms than men (fatigability: men 12.6% vs women 20.9%, χ2 = 14.43, P = 0.001; residual fatigue: men 10.0% vs women 16.5%, P = 0.001). Multivariate logistic regression analyses revealed that being female, nonrestorative sleep, decreased quality of life, and stress showed significant positive associations with fatigability and residual fatigue. However, a significant positive association was found between depressed mood and fatigability, and short sleep duration and long working hours (≥9 h) were specifically significantly positively associated with residual fatigue. Sleep hygiene instruction and a psychiatric approach are needed to reduce fatigue in the Japanese population.
    Sleep and Biological Rhythms 04/2015; 13(2). DOI:10.1111/sbr.12099 · 0.76 Impact Factor
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    ABSTRACT: Recent epidemiological studies have documented that depression is associated with short sleep duration, which may be interpreted as a consequence of comorbid insomnia and/or that of curtailment of time in bed (TIB). However, none of the studies examined association between depression and TIB. Here, we study TIB, short sleep duration and depression in the Japanese general adult population. Cross-sectional surveys with a face-to-face interview were conducted in 2009 as part of the Nihon University Sleep and Mental Health Epidemiology Project (NUSMEP). Data from 2532 individuals were analyzed. The Center for Epidemiologic Studies Depression Scale (CES-D) was used to assess the prevalence of depression with a cut-off point of 16. Sleep habits and sleep problems during the previous month, including bed time, getting up time, sleep duration, insomnia symptoms, and hypnotic medication use were evaluated. TIB was calculated from bed time and getting up time. The prevalence of depression identified with CES-D was 6.0% in total samples, 5.1% in men and 6.7% in women. Multiple logistic regression analysis revealed that both short sleep duration (<6 h) and short TIB (<6 h) were significantly associated with CES-D depression after adjusting for the confounding effects of sociodemographic variables, insomnia symptoms, and hypnotic medication use. We postulate that TIB, a modifiable sleep habit, may be an important target for improvement of sleep hygiene as a means of preventing depression.
    Sleep and Biological Rhythms 04/2015; 13(2):136-145. DOI:10.1111/sbr.12096 · 0.76 Impact Factor
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    ABSTRACT: The purposes of this study were to evaluate the mental health status of Japanese medical students and to examine differences based on gender, as well as on university type and location, using the results of a nationwide survey. Between December 2006 and March 2007, we conducted a questionnaire survey among fourth-year medical students at 20 randomly selected medical schools in Japan. The data from 1,619 students (response rate:90.6%;male:1,074;female:545) were analyzed. We used the Japanese version of the 12-item General Health Questionnaire (GHQ-12) to measure mental health status. Poor mental health status (GHQ-12 score of 4 points or higher) was observed in 36.6% and 48.8% of the male and female medical students, respectively. The ratio of the age-adjusted prevalence of poor mental health status in female versus male medical students was 1.33 (95% confidence interval:1.10-1.62). The universities were categorized into two groups based on the university type (national/public:15 vs. private:5) or location (in a large city:7 vs. in a local city:13 cities). The prevalence of poor mental health status in both men and women differed between these groups, although not significantly. The GHQ-12 scores in men significantly differed between the categorized groups of universities. These results suggest that adequate attention must be paid to the mental health of medical students, especially females, and that a system for providing mental health care for medical students must be established in the context of actual conditions at each university.
    Acta medica Okayama 12/2014; 68(6):331-7. · 0.75 Impact Factor
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    ABSTRACT: 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.
    PLoS ONE 11/2014; 9(11):e111844. DOI:10.1371/journal.pone.0111844 · 3.53 Impact Factor
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    ABSTRACT: The number of people with Internet addiction (IA) in Japan is assumed to have rapidly increased, but the actual conditions have not been unknown. Below we report the changes of estimated prevalence of IA among the adult population of Japan based on the results of the two nationwide surveys we conducted leave five years interval.
    Alcohol and alcoholism (Oxford, Oxfordshire). Supplement 09/2014; 49 Suppl 1:i51. DOI:10.1093/alcalc/agu053.64
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    ABSTRACT: The purpose of this study was to examine the associations of sleep complaints, such as insomnia and snoring, with metabolic syndrome. Data from a national study conducted on residents from randomly selected districts in Japan in 2007 were used. The survey included: (i) information on physical status, (ii) dietary intake, and (iii) a questionnaire on lifestyle characteristics. Data on physical status and lifestyle characteristics available for 3936 adults (1592 men and 2344 women) were analyzed. Multiple logistic regression analysis yielded statistically significant associations. Adjusted odds ratios calculated with reference to metabolic syndrome were 1.23 (95% CI: 1.03–1.48, P = 0.02) for insomnia and 1.89 (95% CI: 1.56–2.30, P < 0.01) for snoring. For insomnia, the adjusted odds ratio in relation to hypertension was 1.28 (95% CI: 1.08–1.52, P < 0.01), and for snoring, the adjusted odds ratios in relation to abdominal obesity and dyslipidemia were 1.90 (95% CI: 1.60–2.26, P < 0.01) and 1.50 (95% CI: 1.27–1.77, P < 0.01), respectively. Metabolic syndrome was found to be closely associated with insomnia and snoring. Such associations should be taken into consideration when developing measures against metabolic syndrome and sleep problems.
    Sleep and Biological Rhythms 07/2014; 12(4). DOI:10.1111/sbr.12071 · 0.76 Impact Factor
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    ABSTRACT: We conducted an epidemiological study to examine the associations between sleep environments and sleep habits in Japanese adolescents. The targets were students attending junior and senior high schools throughout Japan. Sample schools were selected by cluster sampling. Self‐reported anonymous questionnaires were then sent to the schools for all students to complete. A total of 99 416 adolescents responded, with an overall response rate of 64.0%. A total of 96 861 questionnaires were subjected to analysis. Associations between sleep environments (type of bed, lighting during sleep, sharing a bedroom) and sleep duration, bedtimes, wake‐up times, sleep quality, or symptoms of insomnia were examined. In total, 65.5% of the adolescents surveyed slept on a bed, and 33.0% slept on a futon laid on the floor or tatami. In total, 66.6% slept with the light off, 31.0% slept with a dim light on, and 2.0% slept with the light on. Of those surveyed, 69.3% had their own bedrooms, 17.1% shared a bedroom with one other person, 8.0% shared a bedroom with three people, and 5.0% shared a bedroom with four people or more. The factors with high odds ratios with regard to insomnia were use of a futon laid on the floor or tatami, sleeping with the light on, and not sharing a bedroom. Sleep environments are associated with insomnia. Type of bed, lighting, and sharing a bedroom should be considered as factors that affect the sleep of adolescents.
    Sleep and Biological Rhythms 04/2014; 12(2). DOI:10.1111/sbr.12050 · 0.76 Impact Factor
  • Yoshitaka Kaneita
    Sleep and Biological Rhythms 04/2014; 12(2). DOI:10.1111/sbr.12057 · 0.76 Impact Factor
  • Maki Ikeda, Yoshitaka Kaneita
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    ABSTRACT: Sleep disturbance such as insomnia is one of common complaint among adults in developed countries. Insomnia induces sleepiness and drowsiness, resulting in a reduction of working efficiency in the daytime. Drivers in the transportation system and machine operators could cause serious industrial accidents if they have sleep disturbances. Recent studies reported that approximately 20% of Japanese population had sleep disturbances. Here we provide a general account of sleep disturbance about Japanese population.
    Nippon rinsho. Japanese journal of clinical medicine 03/2014; 72(3):573-7.
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    ABSTRACT: The aim of the present study was to clarify the prevalence of excessive daytime sleepiness and its associated factors among pregnant women in Japan. Of the 940 randomly selected survey locations identified by the Japan Association of Obstetricians and Gynecologists, 344 obstetric institutions participated in the survey. The study was conducted on women with confirmed pregnancies who had had a second or subsequent consultation at one of these institutions. The survey items included age, highest educational achievement, trimester of pregnancy, number of pregnancies, employment status, smoking, alcohol consumption, restless sleep, difficulty initiating sleep, difficulty maintaining sleep, early morning awakening, sleep duration, napping, snoring or breathlessness, and restless leg syndrome. The Epworth Sleepiness Scale was used to assess the level of excessive daytime sleepiness. We calculated the prevalence of excessive daytime sleepiness and then examined its associated factors using χ2 test and multiple logistic regression analysis. The prevalence of excessive daytime sleepiness among pregnant women was 6.2%. The results of multiple logistic regression analysis indicated that the adjusted odds ratio with regard to excessive daytime sleepiness was significantly higher among younger women and those in an earlier trimester of pregnancy. The odds ratio with regard to excessive daytime sleepiness was also significantly higher for women in their first pregnancy, full-time workers, and current alcohol consumers. Women indicating the presence of sleep-related issues, including restless sleep, difficulty maintaining sleep, napping, snoring or breathlessness, and symptoms of restless leg syndrome, reported significantly higher levels of excessive daytime sleepiness.
    Sleep and Biological Rhythms 01/2014; 12(1). DOI:10.1111/sbr.12040 · 0.76 Impact Factor
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    ABSTRACT: Background: In order to control the purchase of tobacco by minors from vending machines in Japan, an age verification card system (TASPO) was introduced in 2008. Objective: We investigated serial changes in the amount of tobacco purchased to determine the effectiveness of the age verification card system after performing a nationwide survey of smoking among junior and senior high school students in Japan. Methods: This survey was conducted in 2008 and 2010. We asked 98,867 junior and senior high school students, aged 13-18 years, in Japan about their smoking behavior, where they purchased cigarettes, whether they had used age verification cards, and if so, how they obtained them. Results: Comparison of the results of the 2008 and 2010 surveys indicated that the number of adolescents who bought cigarettes by unlawful use of age verification cards was on the increase. They obtained age verification cards by the following means: (1) taking one that belonged to a senior family member, (2) borrowing one from a family member, (3) borrowing one from someone other than a family member, and (4) obtaining one through the usual application procedure, of which the most-used means was (3). All of these methods were used more often in 2010 than in 2008. Conclusions: It is suggested that the age verification card system in Japan is becoming less effective at inhibiting the purchase of tobacco by minors.
    141st APHA Annual Meeting and Exposition 2013; 11/2013
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    ABSTRACT: In this study, we attempted to clarify the associations between various sleep disturbance symptoms and the frequency and amount of alcohol use among Japanese adolescents. This study was designed as a cross-sectional sampling survey. A self-administered questionnaire survey was administered to students enrolled in randomly selected junior and senior high schools throughout Japan. A total of 99,416 adolescents responded, and 98,867 questionnaires were subjected to analysis. The prevalence rates of sleep disturbance in the 30 days preceding the day of the survey were as follows: subjectively insufficient sleep (SIS) (boys: 37.6%, girls: 38.7%); short sleep duration (SSD) with less than 6 h of sleep (boys: 28.0%, girls: 33.0%); difficulty initiating sleep (DIS) (boys: 12.5%, girls: 14.1%); difficulty maintaining sleep (DMS) (boys: 10.1%, girls: 10.9%); and early morning awakening (EMA) (boys: 5.1%, girls: 5.0%). Adolescents reporting one or more symptoms of DIS, DMS, and EMA were classified as having insomnia, and its prevalence was 21.5%. The prevalence of each symptom of sleep disturbance increased significantly with the number of days on which alcohol was consumed in the previous 30 days and the amount of alcohol consumed per drinking session (p < 0.01). Multiple logistic regression analyses showed that the adjusted odds ratio (AOR) for each symptom of sleep disturbance, except SIS and EMA, tended to increase with the number of days on which alcohol was consumed and the amount of alcohol consumed per drinking session. The prevalence of sleep disturbance is particularly high among adolescents drinking alcohol. The risk of having each symptom of sleep disturbance, except SIS and EMA, increases with the number of days on which alcohol was consumed and the amount of alcohol consumed per drinking session. These findings reconfirm the need to eliminate underage drinking to ensure good sleep among adolescents.
    Alcohol (Fayetteville, N.Y.) 10/2013; DOI:10.1016/j.alcohol.2013.09.041 · 2.04 Impact Factor
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    ABSTRACT: Objectives: This study aimed to clarify the association between long working hours and short sleep duration among Japanese workers. Methods: We selected 4,000 households from across Japan by stratified random sampling and conducted an interview survey of a total of 662 participants (372 men; 290 women) in November 2009. Logistic regression analyses were performed using "sleep duration <6 h per day" as a dependent variable to examine the association between working hours/overtime hours and short sleep duration. Results: When male participants who worked for ≥7 but <9 h per day were used as a reference, the odds ratio (OR) for short sleep duration in those who worked for ≥11 h was 8.62 (95% confidence interval [CI]: 3.94-18.86). With regard to overtime hours among men, when participants without overtime were used as a reference, the OR for those whose period of overtime was ≥3 h but <4 h was 3.59 (95% CI: 1.42-9.08). For both men and women, those with long weekday working hours tended to have a short sleep duration during weekdays and holidays. Conclusions: It is essential to avoid working long hours in order to prevent short sleep duration.
    Journal of Occupational Health 05/2013; DOI:10.1539/joh.12-0257-BR · 1.10 Impact Factor
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    ABSTRACT: OBJECTIVE: The main objective of our study was to clarify the prevalence of disorders of arousal (confusional arousals, sleepwalking, sleep terrors) and sleep-related bruxism (teeth grinding) and their associated factors among Japanese adolescents. METHODS: Our study was designed as a cross-sectional sampling survey. The targets were students attending junior and senior high schools throughout Japan. The questionnaire asked for personal data and information on lifestyle, depressive state, and sleep status including the frequency of experiencing disorders of arousal and sleep-related bruxism. RESULTS: A total of 99,416 adolescents responded. The overall response rate was 63.7%, and 98,411 questionnaires were subjected to analysis. The prevalence of disorders of arousal was 7.1% (95% confidence interval [CI], 6.9-7.3%) among boys and 7.7% (95% CI, 7.5-7.9%) among girls. The prevalence of sleep-related bruxism was 2.3% (95% CI, 2.2-2.4%) among boys and 3.0% (95% CI, 2.8-3.2%) among girls. The factors associated with disorders of arousal were the grade in school, smoking habit, alcohol consumption, naptime (min), breakfast habit, participation in club activities, sleep duration, difficulty initiating sleep, nocturnal awakening, early morning awakening, subjective sleep assessment, snoring, decrease in positive feelings, and depression (all p<.001). The factors associated with sleep-related bruxism were gender, smoking habit, nocturnal awakening, snoring, early morning awakening, decrease in positive feelings, and depressive feelings (all p<.001). CONCLUSIONS: If disorders of arousal or sleep-related bruxism are observed in an adolescent, his or her smoking habit, alcohol consumption, sleep status, and depressive state should be considered.
    Sleep Medicine 05/2013; 14(6). DOI:10.1016/j.sleep.2013.03.005 · 3.10 Impact Factor
  • Health 01/2013; 05(08):1241-1246. DOI:10.4236/health.2013.58168 · 0.51 Impact Factor
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    ABSTRACT: Objectives: The aim of study was to determine the associations of work hours and actual availability of weekly rest days with the onset of lifestyle-related diseases such as obesity, hypertension, hypertriglyceridemia, low levels of high-density lipoprotein (HDL) cholesterol and hyperglycemia.Methods: For this longitudinal study, we used data from checkups conducted in 1999 and 2006 for 30,194 men who worked for a local public institution in Japan. We calculated the cumulative incidence rates of onset of obesity, hypertension, hyperglycemia, hypertriglyceridemia and low HDL cholesterol over this 7-year period and performed a χ(2) test to determine the association between the above diseases and work conditions (work hours and actual availability of weekly rest days) at the time of the baseline survey. We then performed multiple logistic regression analysis of the diseases that showed significant associations.Results: The adjusted odds ratio for the onset of hypertriglyceridemia in subjects who worked ≥9 hours was high (1.11 [95% CI: 1.02-1.22], p = 0.02) in comparison with those who worked <9 hours. The adjusted odds ratio for the onset of hypertriglyceridemia in subjects who could not often take weekly rest days was high (1.13 [95% CI: 1.01-1.27], p = 0.03) in comparison with those who were able to take most of the available weekly rest days off work.Conclusions: These results show that work hours and actual availability of weekly rest days independently predict the onset of hypertriglyceridemia. Working only regular hours and taking advantage of weekly rest days can contribute to the prevention of hypertriglyceridemia.
    Journal of Occupational Health 11/2012; DOI:10.1539/joh.12-0034-OA · 1.10 Impact Factor
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    ABSTRACT: This study aimed to reveal the characteristics of prescribing hypnotics at Japanese medical institutions, with data on medical payments from 4 large-scale Japanese health insurance organizations with almost 320 000 members. The study targeted the data from 4807 patients, aged 20 to 74 years, who were prescribed hypnotics during a 3-month surveillance period. The prescription rate for hypnotics was estimated at 3.66% based on the national population census in 2005. The rate significantly increased with age, especially among women over 60, and markedly increased along with the number of comorbid physical diseases. The percentage of prescriptions from the specialties of psychiatric, neurologic, and psychosomatic medicine held at 37.6%. However, the prescribed doses were still significantly higher for these specialties than for general medicine. Short-acting and ultra short-acting hypnotic medications were frequently prescribed, especially in the group of individuals of advanced age. Due attention should be paid to the risk–benefit balance in prescribing hypnotics to elderly individuals as those having high prescription rates. Although the present study is based on specific groups, the findings provide an important insight into the characteristics of Japanese prescribing hypnotics.
    Sleep and Biological Rhythms 10/2012; 10(4):319-27. DOI:10.1111/j.1479-8425.2012.00573.x · 0.76 Impact Factor
  • Osamu Itani, Maki Ikeda, Yoshitaka Kaneita, Takashi Ohida
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    ABSTRACT: Sleep has been a great interest in modern developed countries, epidemiological studies have been carried out extensively. In 2006, average sleep duration of the Japanese men, has been reported 7 hours 49 minutes (9 minutes shorter than 20 years ago) and women has been reported 7 hours 35 minutes (7 minutes shorter than 20 years ago). Sleep habits is affected by gender, age and also social factors and lifestyle. Thus, sleep-related problems have become an important public health issue in the society in developed countries. It is important to progress the preventive health promotion activities and results that are based on the development of future epidemiological studies of sleep.
    Nippon rinsho. Japanese journal of clinical medicine 07/2012; 70(7):1145-9.
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    ABSTRACT: To date, only limited epidemiological data on the sleep habits of young children in Japan have been available. This study used representative samples to examine the sleep habits of four-and-a-half-year-old children in Japan. We used data from a nationwide cross-sectional survey. A member of each subject's family was asked to complete the questionnaire. The questionnaire included personal characteristics, sleep habits, and lifestyle. The data for 39,813 subject children (collection rate: 74.3%) were analyzed. The mean value of total sleep duration, night-time sleep duration, and daytime napping duration was 10 h 40 min 30 s, 9 h 53 min 0 s, and 46 min 24 s, respectively. The prevalence of daytime napping was 45.8%. Those whose total sleep duration was less than 10h accounted for 13.7% of the sample. The factors associated with high odds ratios for shorter total sleep duration were: living in a less populated area, long hours spent watching television, longer maternal work hours, and attending preschool. In attempting to devise ways of improving the sleep habits of young children, the lifestyles of both the children and their parents must be considered.
    Sleep Medicine 06/2012; 13(7):787-94. DOI:10.1016/j.sleep.2011.11.019 · 3.10 Impact Factor

Publication Stats

896 Citations
184.46 Total Impact Points


  • 2013–2014
    • Oita University
      • Faculty of Medicine
      Ōita, Ōita, Japan
  • 2004–2012
    • Nihon University
      • Department of Public Health
      Edo, Tōkyō, Japan
  • 2009–2011
    • National Center of Neurology and Psychiatry
      • Department of Psychophysiology
      Edo, Tōkyō, Japan
    • Showa University
      • Department of Medicine
      Shinagawa, Tōkyō, Japan
  • 2010
    • Nihon Institute of Medical Science
      Saitama, Saitama, Japan
  • 2008
    • Tottori University
      • Faculty of Medicine
      Tottori, Tottori-ken, Japan