Purpose: The purpose of this study was to examine the level of circadian rhythm, daytime sleepiness, and fatigue andtheir associations by type of shift work among nurses working at a tertiary teaching hospital. Methods: This study was across-sectional descriptive study. A total of 263 nurses were used as subjects. Using a structured survey, circadianrhythm, daytime sleepiness, and fatigue were assessed. Data were analyzed using Statistical Package For The SocialSciences (SPSS) version 26.0. Descriptive statistics were computed to explain sample and variable characteristics. Chi-squared test and independent t-test were used to compare the variables by general characteristics. Pearson’s corre lation coefficients were computed to examine the association between circadian rhythm, daytime sleepiness, and fatigue. Results: The average age of the participants was 27.35±3.99 years old for shift work and 39.63±8.99 years old fornon-shift work. In the circadian rhythm, most non-shift workers were intermediate type (83.3%), but approximatelyone-third of shift workers were evening type (31.0%). Fatigue was significantly higher in shift workers than in non-shiftworkers (t=2.26, p=.024). Fatigue in non-shift workers was significantly associated with circadian rhythm and daytimesleepiness (r=-.35, p=.005; r=.35, p=.006, respectively). However, fatigue in shift workers was only significantly asso ciated with daytime sleepiness (r=.28, p<.001). Conclusion: These findings indicate that customized strategies should beprepared to reduce nurses’ fatigue considering the type of work shift rotation. Nursing administrators need to considernurses’ circadian rhythm before the decision on shift work to expect better nursing outcomes.
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