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. 2014;69(1):23-32.
doi: 10.1080/19338244.2012.713040.

Employment type, workplace interpersonal conflict, and insomnia: a cross-sectional study of 37,646 employees in Japan

Kenji Sakurai  1 , Aknori Nakata, Tomoko Ikeda, Yasumasa Otsuka, Junko Kawahito
Affiliations

Employment type, workplace interpersonal conflict, and insomnia: a cross-sectional study of 37,646 employees in Japan

Kenji Sakurai et al. Arch Environ Occup Health. 2014.

Abstract

This study explored whether workplace interpersonal conflict (WIC) is associated with insomnia, and whether the relationship between WIC and insomnia differs across different employment groups. A total of 37,646 Japanese full-time employees participated in a cross-sectional survey. Employment types included permanent employment and 2 forms of temporary employment: direct-hire and temporary work agent (TWA). Insomnia symptoms, including difficulty initiating sleep, difficulty maintaining sleep, and early morning awakening were measured. Insomnia was defined as having experienced 1 or more of these symptoms on ≥3 nights per week over the past 12 months. Results showed that WIC was significantly associated with an increased risk of insomnia (odds ratio OR = 1.63; 95% confidence interval CI = 1.55-1.71), controlling for confounders. However, the relationship between WIC and the risk of insomnia was significantly stronger for TWAs than for permanent employees (OR = 1.97; 95% CI = 1.13-3.45). A frequent exposure to WIC may increase the risk of insomnia, particularly for TWAs.

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Figures

Fig. 1
Fig. 1
A line chart depicting the estimated mean probability of insomnia as a function of the employment types and workplace interpersonal conflict. WIC = workplace interpersonal conflict; TWAs = temporary work agents.
See this image and copyright information in PMC

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