Ryuji Ogihara

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The study examined the prevalence and correlates of insomnia in a representative sample (n=3030) from the general population of Japan. Using a structured questionnaire, we found that the overall prevalence of insomnia during the preceding month was 21.4%, including difficulty initiating sleep (DIS: 8.3%), difficulty maintaining sleep (DMS: 15.0%), and early(More)
There are few epidemiological studies on sleep loss and daytime sleepiness in the general adult population of Japan. A total of 4000 adult people, aged 20 and over, were randomly drawn from five areas of Japan, and 3030 individuals were interviewed and completed a questionnaire including information about sleep duration and sleep problems. Overall, 29%(More)
OBJECTIVES To investigate the prevalence of centenarians who have preserved activities of daily living (ADLs) and good cognitive and psychosocial status in Japan. DESIGN Census-based survey. SETTING Cross-Sectional Investigation of Half of All Japanese Centenarians Study, 2000. PARTICIPANTS A nationwide census-based study was conducted of all of the(More)
The aim of this study is to investigate the efficacy of a structured intervention program in emotional and physical states of family caregivers for elderly. This program is a series of five weekly 90-minute sessions including psycho-education, problem-solving techniques, and relaxation training. Subjects were 56 primary caregivers looking after relatives(More)
OBJECTIVE This cross-sectional study was conducted to estimate the prevalence of somatic and psychological complaints (SPCs) and to investigate the association of SPCs with insomnia in a sample of the general adult population of Japan. METHODS We randomly selected 4000 adult residents (-20 years old) from five areas of Japan using stratified sampling and(More)
To clarify the effects of daily stress, habitual exercise, drinking and smoking on the prevalence of sleep disorders, we selected 4000 residents (> or =20 years) in Japan by stratified random sampling and carried out structured interviews (response rate 75.8%). Frequencies of sleep disorders (difficulty initiating sleep: DIS; difficulty maintaining sleep:(More)
PURPOSE To investigate quality of life (QOL) and associated factors in centenarians, we conducted a visitation interview survey for all male and one half of the female centenarians living in Japan, and studied QOL, lifestyle and health status. METHODS All the male centenarians and a randomly-sampled half of the female centenarians living in Japan were(More)
A visiting interview survey was performed on all centenarians living in Japan to investigate their Activities of Daily Life (ADL). 2,851 centenarians, 92.9% of all subjects completed the interview. They were divided into three groups, good ADL (almost independent in daily life), moderate ADL (almost independent in indoor life), and inferior ADL (bed fast)(More)
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