Sleep-related Risk of Occupational Injuries in Japanese Small and Medium-scale Enterprises

• Published in: Industrial Health 2005, Vol.43(1), pp.89-97
• Main Authors: NAKATA, Akinori, IKEDA, Tomoko, TAKAHASHI, Masaya, HARATANI, Takashi, FUJIOKA, Yosei, FUKUI, Satoe, SWANSON, Naomi G., HOJOU, Minoru, ARAKI, Shunichi
• Format: Article
• Language: English
• Subjects: Accidents, Occupational - statistics & numerical data; Adolescent; Adult; Aged; Aged, 80 and over; Cross-Sectional Studies; Epidemiology; Female; Habits; Humans; Industry - classification; Japan - epidemiology; Male; Middle Aged; Occupational injury; Prevalence; Risk Factors; Safety; Sleep; Sleep Wake Disorders - complications; Sleep Wake Disorders - epidemiology; Small and medium-scale enterprise; Surveys and Questionnaires; Wounds and Injuries - epidemiology
• ISSN: 0019-8366; 1880-8026
• DOI: 10.2486/indhealth.43.89

A cross-sectional study evaluated the contribution of daily sleep habits to occupational injuries. A self-administered questionnaire solicited answers about sleep, symptoms of depression, occupational injury, demographics, presence of diseases and lifestyle factors from 2,903 workers between the ages of 16-83 (mean 45) yr in small and medium-scale enterprises. Eight sleep habits were queried and dichotomized: 1) less or more than 6 hr of daily sleep, 2) taking more or less than 30 min to fall asleep (Difficulty initiating sleep; DIS), 3) awakening during sleep more or less than 3 times/wk (Difficulty maintaining sleep; DMS), 4) early morning awakening more or less than 3 times/wk (EMA), 5) definitely/somewhat difficulty waking up or not, 6) sleeping very poorly/not so well at night or not, 7) definitely/somewhat insufficient nightly sleep or not, and 8) difficulty in breathing during sleep more than once/week or less. Occupational injury was assessed by asking subjects ‘Have you ever been injured during your work, including minor scratches and cuts (Yes/No)?’ Both sleep and injury were assessed over the previous one year period. One-third of workers answered that they had experienced injury. Workers with sleep features of DIS, sleeping poorly at night, insufficient sleep, and insomnia had a significantly higher prevalence for injury after adjusting for multiple confounders. The findings suggest that poor nocturnal sleep habits are associated with self-reported occupational injury.