Abstract
Method
We investigated 5,951 male employees aged 34–59 years from two local governments in Japan. Data were obtained from a questionnaire
distributed in advance of their annual health check-up. Employment level was categorized as higher-level non-manual workers,
lower-level non-manual workers, and manual workers. Psychosocial work environment was assessed using the Demand-Control Model
and the Effort-Reward Imbalance Model (ERI). Insomnia was assessed using the Athens Insomnia Scale.
distributed in advance of their annual health check-up. Employment level was categorized as higher-level non-manual workers,
lower-level non-manual workers, and manual workers. Psychosocial work environment was assessed using the Demand-Control Model
and the Effort-Reward Imbalance Model (ERI). Insomnia was assessed using the Athens Insomnia Scale.
Results
The results showed that 1,382 (23.2 %) participants suffered from insomnia. Lower employment level was significantly associated
with a higher risk of insomnia. Job strain (ratio of job demand to job control), E/R (ratio of job effort to job reward),
and OC (over commitment) were also significantly associated with insomnia. The relative excess risk due to the interaction
between employment level and psychosocial environment (job strain, E/R, and OC) was 0.09 (95 % CI −0.57 to 0.76), 2.61 (0.74
to 4.48), and 3.14 (0.82 to 5.45), respectively; synergy index = 1.07 (0.66 to 1.74), 1.99 (1.37 to 2.90), and 2.25 (1.46
to 3.46), respectively.
with a higher risk of insomnia. Job strain (ratio of job demand to job control), E/R (ratio of job effort to job reward),
and OC (over commitment) were also significantly associated with insomnia. The relative excess risk due to the interaction
between employment level and psychosocial environment (job strain, E/R, and OC) was 0.09 (95 % CI −0.57 to 0.76), 2.61 (0.74
to 4.48), and 3.14 (0.82 to 5.45), respectively; synergy index = 1.07 (0.66 to 1.74), 1.99 (1.37 to 2.90), and 2.25 (1.46
to 3.46), respectively.
- Content Type Journal Article
- Pages 1-10
- DOI 10.1007/s12529-012-9230-9
- Authors
- Eiji Yoshioka, Department of Health Science, Asahikawa Medical University, Midorigaoka E2-1-1-1, Asahikawa, Hokkaido 078-8510, Japan
- Yasuaki Saijo, Department of Health Science, Asahikawa Medical University, Midorigaoka E2-1-1-1, Asahikawa, Hokkaido 078-8510, Japan
- Toshiko Kita, Department of Public Health Sciences, Hokkaido University Graduate School of Medicine, Kita 15, Nishi 7, Kita-ku, Sapporo, 060-8638 Japan
- Hiroki Satoh, Department of Public Health Sciences, Hokkaido University Graduate School of Medicine, Kita 15, Nishi 7, Kita-ku, Sapporo, 060-8638 Japan
- Mariko Kawaharada, Department of Comprehensive Development Nursing, Faculty of Health Sciences, Hokkaido University, Kita 12, Nishi 5, Kita-ku, Sapporo, 060-0812 Japan
- Reiko Kishi, Center for Environmental and Health Sciences, Hokkaido University, Kita 12, Nishi 7, Kita-ku, Sapporo, 060-0812 Japan
- Journal International Journal of Behavioral Medicine
- Online ISSN 1532-7558
- Print ISSN 1070-5503