title: Association between duration of daily visual display terminal work and insomnia among local government clerks in Japan.
abstract: BACKGROUND
  Visual display terminal (VDT) work has become very common among office workers in developed countries; however, studies investigating the association between the duration of daily VDT work and insomnia are limited.
  
  
  METHODS
  The aim of this study was to clarify the association between the duration of daily VDT work and sleep disturbances. We investigated 2,417 clerks (men, 2,030; women, 387) at local government offices. Sleep disturbances were evaluated using the Athens Insomnia Scale (AIS).
  
  
  RESULTS
  VDT work of 6 hr or more per day was significantly associated with insomnia (odds ratio = 1.62, 95% confidence interval: 1.16-2.27) and, in particular, caused problems with "total sleep duration" and "sleepiness during the day" among sleep-related symptoms, even after adjusting for possible confounding factors.
  
  
  CONCLUSIONS
  Our study suggested that VDT work of 6 hr or longer per day was related to insomnia.
authors.affiliation: Department of Public Heath, Hokkaido University Graduate School of Medicine, Sapporo City, Japan. e-yoshi@med.hokudai.ac.jp
authors.forename: Eiji
authors.initials: E
authors.lastname: Yoshioka
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Saijo
authors.forename: Tomonori
authors.initials: T
authors.lastname: Fukui
authors.forename: Mariko
authors.initials: M
authors.lastname: Kawaharada
authors.forename: Reiko
authors.initials: R
authors.lastname: Kishi
mesh_terms: D000328:Adult; D016287:Computer Peripherals; D005260:Female; D006076:Government; D006305:Health Status Indicators; D006306:Health Surveys; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology / Q000209:etiology*; D016273:Occupational Exposure / Q000009:adverse effects*; D012307:Risk Factors; D012737:Sex Factors; D018434:Sickness Impact Profile; D007319:Sleep Initiation and Maintenance Disorders / Q000453:epidemiology / Q000209:etiology*; D011795:Surveys and Questionnaires; D013997:Time Factors