Workplace social capital and the onset of major depressive episode among workers in Japan: A 3-year prospective cohort study

Asuka Sakuraya, Kotaro Imamura, Akiomi Inoue, Akizumi Tsutsumi, Akihito Shimazu, Masaya Takahashi, Takafumi Totsuzaki, Norito Kawakami

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Background This study examined the prospective association of workplace social capital (WSC) with major depressive episode (MDE) among Japanese employees. Methods A 3-year prospective cohort study was conducted among 1058 employees from a private thinktank company who participated in a baseline survey; after excluding those with MDE in the past 12 months, 929 were followed up. WSC at baseline was measured using a 3-item scale. MDE was assessed at baseline and at follow-up every year, by using a web-based, selfadministered version of the WHO Composite International Diagnostic Interview (WHO-CIDI) 3.0 depression section, based on the Diagnostic and Statistical Manual of Mental Disorders Fourth Edition: Text Revision (DSM-IV-TR)/DSM-5 criteria. Cox discretetime hazards analyses were used to estimate HRs and 95% CIs, adjusting for covariates. Results A group with middle-level WSC scores had the lowest risk of MDE after being fully adjusted (HR 0.34, 95% CI 0.14 to 0.84, p=0.02). The relationship between WSC and MDE was U-shaped, although a nonlinear model fit better than a linear model, with only marginally statistical significance (p=0.06). Dichotomised and continuous variables of WSC scores were significantly and negatively associated with MDE (p=0.03 and p<0.01, respectively). Conclusions The current study replicated a previous finding from Finland that WSC was a protective factor of the onset of MDE in Japan. The slightly U-shaped relationship, that is, the group with high WSC having a small elevated risk of MDE, may reflect a dark side of WSC in a country with collectivity-oriented and hierarchy-oriented culture, such as Japan.

Original languageEnglish
Pages (from-to)606-612
Number of pages7
JournalJournal of Epidemiology and Community Health
Volume71
Issue number6
DOIs
Publication statusPublished - 2017 Jun 1
Externally publishedYes

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Workplace
Japan
Cohort Studies
Prospective Studies
Diagnostic and Statistical Manual of Mental Disorders
Nonlinear Dynamics
Social Capital
Finland
Linear Models
Interviews

ASJC Scopus subject areas

  • Epidemiology
  • Public Health, Environmental and Occupational Health

Cite this

Workplace social capital and the onset of major depressive episode among workers in Japan : A 3-year prospective cohort study. / Sakuraya, Asuka; Imamura, Kotaro; Inoue, Akiomi; Tsutsumi, Akizumi; Shimazu, Akihito; Takahashi, Masaya; Totsuzaki, Takafumi; Kawakami, Norito.

In: Journal of Epidemiology and Community Health, Vol. 71, No. 6, 01.06.2017, p. 606-612.

Research output: Contribution to journalArticle

Sakuraya, Asuka ; Imamura, Kotaro ; Inoue, Akiomi ; Tsutsumi, Akizumi ; Shimazu, Akihito ; Takahashi, Masaya ; Totsuzaki, Takafumi ; Kawakami, Norito. / Workplace social capital and the onset of major depressive episode among workers in Japan : A 3-year prospective cohort study. In: Journal of Epidemiology and Community Health. 2017 ; Vol. 71, No. 6. pp. 606-612.
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abstract = "Background This study examined the prospective association of workplace social capital (WSC) with major depressive episode (MDE) among Japanese employees. Methods A 3-year prospective cohort study was conducted among 1058 employees from a private thinktank company who participated in a baseline survey; after excluding those with MDE in the past 12 months, 929 were followed up. WSC at baseline was measured using a 3-item scale. MDE was assessed at baseline and at follow-up every year, by using a web-based, selfadministered version of the WHO Composite International Diagnostic Interview (WHO-CIDI) 3.0 depression section, based on the Diagnostic and Statistical Manual of Mental Disorders Fourth Edition: Text Revision (DSM-IV-TR)/DSM-5 criteria. Cox discretetime hazards analyses were used to estimate HRs and 95{\%} CIs, adjusting for covariates. Results A group with middle-level WSC scores had the lowest risk of MDE after being fully adjusted (HR 0.34, 95{\%} CI 0.14 to 0.84, p=0.02). The relationship between WSC and MDE was U-shaped, although a nonlinear model fit better than a linear model, with only marginally statistical significance (p=0.06). Dichotomised and continuous variables of WSC scores were significantly and negatively associated with MDE (p=0.03 and p<0.01, respectively). Conclusions The current study replicated a previous finding from Finland that WSC was a protective factor of the onset of MDE in Japan. The slightly U-shaped relationship, that is, the group with high WSC having a small elevated risk of MDE, may reflect a dark side of WSC in a country with collectivity-oriented and hierarchy-oriented culture, such as Japan.",
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AB - Background This study examined the prospective association of workplace social capital (WSC) with major depressive episode (MDE) among Japanese employees. Methods A 3-year prospective cohort study was conducted among 1058 employees from a private thinktank company who participated in a baseline survey; after excluding those with MDE in the past 12 months, 929 were followed up. WSC at baseline was measured using a 3-item scale. MDE was assessed at baseline and at follow-up every year, by using a web-based, selfadministered version of the WHO Composite International Diagnostic Interview (WHO-CIDI) 3.0 depression section, based on the Diagnostic and Statistical Manual of Mental Disorders Fourth Edition: Text Revision (DSM-IV-TR)/DSM-5 criteria. Cox discretetime hazards analyses were used to estimate HRs and 95% CIs, adjusting for covariates. Results A group with middle-level WSC scores had the lowest risk of MDE after being fully adjusted (HR 0.34, 95% CI 0.14 to 0.84, p=0.02). The relationship between WSC and MDE was U-shaped, although a nonlinear model fit better than a linear model, with only marginally statistical significance (p=0.06). Dichotomised and continuous variables of WSC scores were significantly and negatively associated with MDE (p=0.03 and p<0.01, respectively). Conclusions The current study replicated a previous finding from Finland that WSC was a protective factor of the onset of MDE in Japan. The slightly U-shaped relationship, that is, the group with high WSC having a small elevated risk of MDE, may reflect a dark side of WSC in a country with collectivity-oriented and hierarchy-oriented culture, such as Japan.

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