Psychological factors and insomnia among male civil servants in Japan.
OBJECTIVE
This study aims at assessing the relative impact of psychological factors on insomnia among daytime workers.


BACKGROUND
Insomnia affects 5-45% of non-shift workers, making it a serious public health concern.


METHODS
The study population was 3435 male civil servants aged 35 years and over. A self-administered questionnaire survey was conducted in 2002. Annual health examination data compiled in the same year were also obtained. Insomnia was assessed in three domains: difficulty initiating sleep (DIS), difficulty maintaining sleep (DMS), and poor quality of sleep (PQS). Association of each factor with insomnia was examined by age-adjusted logistic regression models. Factors significantly associated with insomnia in age-adjusted analyses were entered in the stepwise logistic regression models to test the relative impact of each factor.


RESULTS
Prevalence of insomnia was 12.3% (DIS), 20.4% (DMS), and 32% (PQS). In stepwise logistic models, high perceived stress was associated with all types of insomnia with odds ratios (95% confidence interval) of 2.27 (1.58-3.26), 2.15 (1.57-2.95), and 2.96 (2.19-3.99), for DIS, DMS, and PQS, respectively. Poor psychological well-being or not having confidants was also associated with insomnia. Somatic conditions such as illnesses or history of hospitalization were related to DIS and DMS.


CONCLUSIONS
Psychological factors were strongly associated with DIS and PQS after controlling for possible confounders. In dealing with insomnia, such factors must not be neglected.
Murata
Chiyoe
C
Department of Community Health and Preventive Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu, Shizuoka 431-3192, Japan. cmurata@hama-med.ac.jp
Yatsuya
Hiroshi
H
Tamakoshi
Koji
K
Otsuka
Rei
R
Wada
Keiko
K
Toyoshima
Hideaki
H
D000328:Adult; D000368:Aged; D015331:Cohort Studies; D015897:Comorbidity; D003430:Cross-Sectional Studies; D005260:Female; D006304:Health Status; D006306:Health Surveys; D006801:Humans; D007564:Japan; D007588:Job Satisfaction; D009111:Local Government; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology / Q000523:psychology*; D011788:Quality of Life / Q000523:psychology; D007319:Sleep Initiation and Maintenance Disorders / Q000453:epidemiology / Q000523:psychology*; D012944:Social Support; D013315:Stress, Psychological / Q000150:complications; D014851:Wakefulness; D016526:Workload / Q000523:psychology