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KMID : 1039220150250040566
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Journal of Korean Society of Occupational and Environmental Hygiene
2015 Volume.25 No. 4 p.566 ~ p.572
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The Change of Sleep Quality after Transition to Consecutive Day Shift from Day and Night Shift: A Motor Assembly Factory Case
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Song Han-Soo
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Abstract
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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.
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KEYWORD
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shift work, insomnia, PSQI
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