| Summary: | 碩士 === 高雄醫學大學 === 職業安全衛生研究所碩士班 === 93 === Background： The shift work is a common working type of high-tech industries and 9.3% female workers are belong to shift-work labors in Taiwan. Regular menstruation cycle and pattern reflect the reproductive and endocrine functions of a woman. Circadian pattern may be changed by rotating shift-work which may cause irregular menstruation, prolong menstruation and endocrine function disorder.
Objective：To investigate the prevalence of irregular menstruation of 4-shift-2-rotate shift workers.
Design ： longitudinal study.
Setting ：Staffs of a photoelectron company in the Tainan Science Park in Taiwan .
Participation: 329 employees (49 day workers, 280 4-shift-2-rotate shift workers) who were 16-45y/o women.
Results：The shift women had the higher oligomenorrhea than day time workers. After adjustment for confounders, compared with day worker odds, 1.71(1.03-2.88).We concluded rotate work is associated with irregular menstrual cycle.
Conclusion：The 4-shift-2-rotate shift workers have highly irregular menstrual cycles compared with day time workers. Moreover, the increasing is statistically significantly.
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