Buffering Effect of Social Support in the Workplace on Job Strain and Depressive Symptoms

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  • KOMATSU Yuki
    School of Nursing, Faculty of Medicine, Toho University
  • KAI Yuko
    Physical Fitness Research Institute, Meiji Yasuda Life Foundation of Health and Welfare
  • NAGAMATSU Toshiya
    Physical Fitness Research Institute, Meiji Yasuda Life Foundation of Health and Welfare
  • SHIWA Tadashi
    Second Department of Internal Medicine, School of Medicine, Yokohama City University
  • SUYAMA Yasuo
    Physical Fitness Research Institute, Meiji Yasuda Life Foundation of Health and Welfare
  • SUGIMOTO Masako
    School of Nursing, Faculty of Medicine, Toho University

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Other Title
  • 職業性ストレスと抑うつの関係における職場のソーシャルサポートの緩衝効果の検討
  • ショクギョウセイ ストレス ト ヨクウツ ノ カンケイ ニ オケル ショクバ ノ ソーシャルサポート ノ カンショウ コウカ ノ ケントウ

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Objective: The present study examined the buffering effect of social support in the workplace on job strain and depressive symptoms by conducting a cross-sectional survey using a self-report. Methods: The subjects were 712 employees (male, over 40 yr old) who worked at a precision machine factory. The questionnaire determined the subjects, ages, types of occupation, scores of depressive symptoms, job strain (job demand and job control), and social support (supervisor support and coworker support). Job strain and social support were evaluated by the Job Content Questionnaire (JCQ). The Center for Epidemiologic Studies Depression Scale (CES-D) score was measured and depressive symptoms were defined as a CES-D score ≥ 16 point. Job strain and social support were calculated and divided into low-score groups (LG) and high-score groups (HG), respectively, by the median value. The mean values of CES-D in the LG and HG of job strain or social support were compared by the t-test. The hierarchical multiple regression was analyzed with the CES-D score as the dependent variable and by the characteristics of the participants, job strain and social support, and the cross-product interaction term of job strain and social support as independent variables. The effect of the degree of social support in the LG and HG of job strain on the CES-D score was evaluated by analysis of covariance adjusted for age. Results: The results showed that 23.2% of the workers had depressive symptoms, and that, the CES-D scores in the job demand group were significantly higher in HG than in LG. The CES-D scores in the job control, supervisor support, and coworker support groups were significantly higher in LG than in HG. The hierarchical multiple regression analysis showed that job demand, job control, supervisor support, and coworker support had significant main effects on the CES-D score. Furthermore, it was shown that there was a significant interaction in the CES-D score between job control and supervisor support, and that, the CES-D score in the supervisor support group was significantly higher in LG than that in HG only when job control was low. Conclusions: These results suggest that supervisor support may have the effect of buffering depressive symptoms related to low job control.<br> (San Ei Shi 2010; 52: 140-148)<br>

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