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Original Article
The association of job training duration and risk of depression among wage workers: an analysis of the mediating factors
Dong Geon Kim, Dong Kyu Kim, Kiook Baek
Ann Occup Environ Med 2024;36:e7.   Published online March 22, 2024
DOI: https://doi.org/10.35371/aoem.2024.36.e7
AbstractAbstract AbstractAbstract in Korean PDFSupplementary Material
Background

Research on job training and job satisfaction has been conducted from various perspectives. Job training is thought to be associated with job satisfaction, which is known as an important factor for depression among workers. We hypothesized that job training duration could influence depression through potential mediators (job satisfaction, motivation to work, and work engagement).

Methods

This study encompassed participants from the sixth Korean Working Conditions Survey (KWCS), conducted between 2020 and 2021. To show the relationships between demographic or occupational characteristics and risk of depression, a χ2 test was conducted. The association between job training duration, potential mediators, and risk of depression was analyzed by constructing multiple logistic regression models. The mediating effects of potential mediators on job training duration and risk of depression was evaluated with flexible mediation analysis with weighting-based methods.

Results

The final study population consisted of 25,294 participants. Longer job training duration significantly decreased risk of depression after adjusting for confounders. In the group that received the longest job training duration (≥ 10 days), compared with the group without job training, the odds ratio (OR) for high risk of depression was 0.46 (95% confidence interval [CI], 0.39–0.54). Each three potential mediators showed statistically significant indirect effects and direct effect. Although indirect effects were not strong compared to direct effect, motivation to work had the strongest mediating effect in this study, with an OR of 0.94 (95% CI, 0.92–0.95).

Conclusions

Job training duration was found to have a statistically significant negative association on the risk of depression, and three mediators partially mediating this effect. Although the mechanism was unknown, our findings suggest that job training has a positive influence on workers' mental health. Furthermore, by suggesting the possibility of other pathways existing between job training and depression, we provide directions for future research.

임금근로자에서 직무교육과 우울증 사이의 연관성: 매개요인 분석
목적
직무교육과 직무만족도에 대한 연구는 다양한 관점에서 진행되었다. 직무교육은 직무만족도와 연관이 있는 것으로 알려져 있으며, 근로자들에 있어 우울증의 중요한 요인 중 하나로 직무만족도가 지목되고 있다. 이번 연구에서는 직무교육기간이 잠재적인 매개요인들(직무만족도, 직무동기, 직무열의)를 통해 우울증에 영향을 미칠 수 있을 거라는 가설을 세웠다.
방법
이 연구는 2020년부터 2021년까지 시행한 제6차 근로환경조사에서 데이터를 얻었다. 우울증과 직업적, 인구적 특성의 관계를 분석하기 위해 카이 제곱 검정을 시행하였다. 직무교육 일수와 우울증 위험도의 관계를 확인하기 위해 로지스틱 회귀분석을 사용하였으며, 잠재적 매개요인들의 매개효과를 분석하기 위해 가중치를 부여하여, flexible mediation analysis를 시행하였다.
결과
최종적으로 연구에 참여한 참가자는 25,294명이었다. 긴 직무교육을 받은 그룹일수록 유의하게 우울증의 위험도가 감소하였다. 가장 긴 교육(10일 이상)을 받은 군은 교육을 받지 않은 군에 비해 우울증 위험도의 오즈비가 0.46 (95% 신뢰구간 0.39-0.54) 였다. 각각의 매개요인들에서 간접효과와 직접효과 모두 통계적으로 유의하였다. 간접효과는 직접효과에 비해 크지 않았고, 가장 강한 간접효과는 직무동기에서, 1-3일의 직무훈련을 받은 경우, 오즈비는 0.94 (95% 신뢰구간 0.92-0.95) 였다.
결론
이 연구를 통해 직무교육은 우울증 위험도에 유의한 영향을 끼치며, 그 과정에 직무만족도와 다른 요인들이 부분적인 매개효과를 가진다는 것을 확인할 수 있었다. 그 기전을 알 수는 없었지만, 이번 연구를 통해 직무교육은 근로자의 정신건강에도 긍정적인 효과를 가진다는 것을 보일 수 있었다. 또한 직무교육과 우울증 사이의 다른 매개 경로가 있을 가능성을 제시함으로써, 추후 연구의 방향을 제시할 수 있었다.
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Original Article
The PTSD Symptom and Related Factors among the Residents after Samsung-Hebei Spirits Oil Spill
Seongsik Cho, Tae Kyung Lee, Jeong Min Kim, Ye Won Bang, Narae Hong, Hyoung June Im, Young Jun Kwon, Yong Cho, Jae Yong Moon, Young Su Ju
Korean Journal of Occupational and Environmental Medicine 2009;21(3):235-245.   Published online September 30, 2009
DOI: https://doi.org/10.35371/kjoem.2009.21.3.235
AbstractAbstract PDF
BACKGROUND
The purpose of the study was to estimate the mental health problems and other related factors in residents that experienced the Samsung-Hebei spirits oil spill by surveying PTSD symptoms.
METHOD
Trained interviewers performed direct interviews of the residents approximately 70 days after the oil spill. We investigated PTSD symptoms through PTSD Symptom Scale Interview Version (PSS-I). To determine those factors related to PTSD symptoms, the following factors were determined as part of the survey: gender, age, occupation, duration of cleanup activity, monthly income and amount of debt. Logistic regression analysis was used to analyze all factors.
RESULTS
Of the 318 residents investigated, 56.6% of the subjects had PTSD symptoms related to the spirits oil spill (about 70 days post spill). With regard to occupation, those subjects answering fishery (POR:3.05) and commerce (POR:4.24) as their occupations experienced higher PTSD symptoms than residents answering farming as their occupation. Residents who answered that they had debt over 10 million KRW (POR:2.61) were more vulnerable to PTSD symptoms compared to residents without debt; residents with acute physical symptoms were vulnerable (POR:5.11) to PTSD symptom compared to residents without acute physical symptoms. The results of multiple logistic analysis, including the cleanup activity, age, gender, occupation, acute physical symptoms and amount of debt in the model suggest that only cleanup activity increased PTSD symptoms. The subjects who had engaged in cleanup activities for longer periods of time had more PTSD symptoms and an additional dose-response relationship.
CONCLUSION
Many residents in Samsung-Hebei spirits oil spill area had PTSD symptoms. This suggests that there were serious mental health problems among the residents, who might require specific social supports and psychiatric interventions as a result of the oil spill.

Citations

Citations to this article as recorded by  
  • Human health and ecological assessment programs for Hebei Spirit oil spill accident of 2007: Status, lessons, and future challenges
    Dawoon Jung, Jung-Ah Kim, Myung-Sook Park, Un Hyuk Yim, Kyungho Choi
    Chemosphere.2017; 173: 180.     CrossRef
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