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Keywords:

  • visual display terminals;
  • insomnia;
  • sleep-related symptoms;
  • Athens insomnia scale;
  • clerks

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. Am. J. Ind. Med. 51:148–156, 2008. © 2007 Wiley-Liss, Inc.