A study of 1574 nurses in 6 hospitals was carried out using an questionnaire without respondent's name in order to examine the relation between working conditions and chronic, accumulative fatigue in nurses working in three-shifts. We recognized a strong relation between accumulative fatigue in nurses and work position, age, experience and marital status. In particular, having a family was an important factor in increasing motivation for work. The close relation between the number of hours worked, overtime, type of weekly holiday, and how days off and salary were obtained was also confirmed. There was an especially close relation between overtime work, type of weekly holiday and accumulative fatigue. Since the number of hours worked in a day was very long, without a regular schedule of two or more days off , an increase in the amount of mental, social and physical fatigue was confirmed. In hospitals where the number of night shifts was studied, a recommendation by the National Personnel Authority was being followed, and no difference in fatigue was seen based on the number of night shifts. The results of this study suggest that improvements aimed at implementing a full two-day weekly holiday system are necessary in order to ensure regular rests of more than one day and to improve personnel distribution to eliminate overtime.
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