Factors influencing fatigue and its correlation with depressive symptoms, and their impact on turnover or transfer intentions: a retrospective study in an Okinawan ICU.

Objective: This study aimed to investigate factors influencing fatigue, its relationship with turnover or transfer intention (TTI), and its impact on the mental health of intensive care unit (ICU) nurses in rural Okinawa, Japan. In this region, career options are limited, and many female nurses struggle with balancing work and household responsibilities, potentially contributing to fatigue and mental health challenges. Patients and Methods: A retrospective observational study was conducted with 28 ICU nurses from an acute care hospital in Okinawa. Fatigue and depressive symptoms were assessed using the Japanese Workers' Accumulated Fatigue Self-Diagnosis Checklist and Patient Health Questionnaire-9 (PHQ-9). Participants were categorized according to fatigue levels (Low-High and Highest) and TTI status. Univariate analysis was used to examine the relationships between fatigue, TTI, and variables including gender, marital status, interpersonal issues, and nursing experience. Results: The Highest fatigue group accounted for 67.9% of the participants, and 42.9% were classified as having mild depression. The Highest fatigue group showed significantly higher PHQ-9 scores, longer nursing experience, and higher proportions of married nurses compared to the Low-High fatigue group ( Conclusion: This study found a correlation between ICU nurses' subjective fatigue and mental health, suggesting that severe fatigue, particularly due to interpersonal challenges, may be linked to TTI, highlighting the need for early interventions. However, no direct link was found between fatigue, depressive symptoms, and TTI. Further longitudinal research is required to clarify causality and enhance interventions. In rural areas such as Okinawa, where career options are limited, tailored interventions targeting fatigue and interpersonal challenges are essential.