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Effects of long work hours and poor sleep characteristics on workplace injury among full-time male employees of small- and medium-scale businesses.

Authors
Nakata-A
Source
J Sleep Res 2011 Dec; 20(4):576-584
NIOSHTIC No.
20038294
Abstract
The aim of this study was to investigate the effects of long work hours and poor sleep characteristics on workplace injury. A total of 1891 male employees, aged 18-79 years (mean 45 years), in 296 small- and medium-scale businesses in a suburb of Tokyo were surveyed by means of a self-administered questionnaire during August-December 2002. Work hours and sleep characteristics, including daily sleep hours, subjective sleep sufficiency, sleep quality and easiness to wake up in the morning, were evaluated. Information on workplace injury in the past 1-year period was self-reported. The risk of workplace injury associated with work hours and poor sleep was estimated using multivariate logistic regression with odds ratio (ORs) and 95% confidence intervals as measures of associations. Compared with those working 6-8 h day-1 with good sleep characteristics, positive interactive effects for workplace injury were found between long work hours (>8-10 h day-1 or >10 h day-1) and short sleep duration (<6 h) [adjusted OR (aOR), 1.27-1.54], subjective insufficient sleep (aOR, 1.94-1.99), sleep poorly at night (aOR, 2.23-2.49) and difficulty waking up in the morning (aOR, 1.56-1.59). Long work hours (aOR, 1.31-1.48), subjective insufficient sleep (aOR, 1.49) and sleeping poorly at night (aOR, 1.72) were also independently associated with workplace injury. This study suggests that long work hours coupled with poor sleep characteristics are synergistically associated with increased risk of workplace injury. Greater attention should be paid to manage/treat poor sleep and reduce excessive work hours to improve safety at the workplace.
Keywords
Worker-health; Work-analysis; Work-intervals; Shift-work; Shift-workers; Sleep-deprivation; Men; Injuries; Small-businesses; Questionnaires; Health-surveys; Mathematical-models; Risk-analysis; Risk-factors; Synergism; Workplace-studies; Author Keywords: overtime; safety; sleep; small- and medium-scale business; work hours; workplace injury
Contact
Akinori Nakata, PhD, National Institute for Occupational Safety and Health, Division of Applied Research and Technology, MS-C24, 4676 Columbia Parkway, Cincinnati, OH 45226, USA
CODEN
JSRSEU
Publication Date
20111201
Document Type
Journal Article
Email Address
cji5@cdc.gov
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Issue of Publication
4
ISSN
0962-1105
NIOSH Division
DART
Priority Area
Services
Source Name
Journal of Sleep Research
State
OH
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