Association between duration of daily visual display terminal work and insomnia among local government clerks in Japan.
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.
Yoshioka
Eiji
E
Department of Public Heath, Hokkaido University Graduate School of Medicine, Sapporo City, Japan. e-yoshi@med.hokudai.ac.jp
Saijo
Yasuaki
Y
Fukui
Tomonori
T
Kawaharada
Mariko
M
Kishi
Reiko
R
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