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주야2교대제에서 주간연속2교대제로의 전환 후 스트레스반응의 감소와 관련인자: 일개 완성차 제조사의 사례
송한수 ( Hansoo Song ) 한국산업보건학회 (구 한국산업위생학회) 2016 한국산업보건학회지 Vol.26 No.4
Objectives: The major objective of this study was to analyze stress response after a change to consecutive day shifts from day and night shifts in a motor assembly factory. Methods: Using a survey conducted by a labor union, we collected data on stress response index(SRI), lifestyle factors, work-family conflict and job stress before and after a shift system change. We analyzed the transition on the SRI among 222 workers. The cut-off point for the SRI was a T-score over 60. Results: The high risk stress response group was 20.3% of the population before the shift system change. After the shift system change it decreased to 11.3%. After the shift system change, social support improved, leisure time became more sufficient, work-family conflict declined, and sleep quality in the night shift week improved. In multivariable linear regression, among workers under 40 years old sleep quality on night shift, leisure time sufficiency, social support and work-family conflict contributed to the improvement of stress response. Among workers over 40, work-family conflict contributed to the improvement of stress response. Conclusions: The change to consecutive day shifts improved stress response and mediated with improved nighttime sleep, decreased work-family conflict, increased leisure time and improved work-family conflict.
주야2교대제에서 주간연속2교대제로의 전환 후 수면의 질 변화: 일개 완성차 제조사의 사례
송한수 ( Hansoo Song ) 한국산업보건학회 2015 한국산업보건학회지 Vol.25 No.4
Objectives: The major objective of this study was to analyze insomnia after the change to consecutive day shift from day and night shift in a motor assembly factory. Materials: Data were collected at before and after shift system change through a survey conducted by a labor union. We analyzed transition of PSQI(Pittsburgh Sleep Quality Index) among 222 workers by separating the day shift week and night shift week. The cut-off point of insomnia was 8.5 on the PSQI. Results: Mean PSQI in the day shift week significantly did not decrease, going from 6.36±3.23 to 6.46±3.00(p=0.612 by paired t-test), Mean PSQI for night shift week significantly decreased from 8.31±3.36 to 6.19±3.18(p<0.001 by paired t-test). However, mean PSQI in the day shift week increased from 6.33 ±3.83 to 7.11 ± 2.86 in ≥50 years(p=0.085, by repeated measured ANOVA). Mean PSQI score in the night shift week improved more in the married group(from 8.38±3.27 to 6.12±3.18) than in the non-married group(from 7.82±3.27 to 6.12 ±3.18)(p=0.038, by repeated measured ANOVA). Conclusions: The change to consecutive day shift improved insomnia in night shift. However, insomnia in the day shift week was worsened among those more than 50 years old.