Relationship Between Shift Intensity and Insomnia Among Hospital Nurses in Korea: A Cross-sectional Study

• Published in: Journal of preventive medicine and public health Vol. 54; no. 1; pp. 46 - 54
• Main Authors: Chung, Yuhjin, Kim, Hyunjoo, Koh, Dong-Hee, Park, Ju-Hyun, Yoon, Seohyun
• Format: Journal Article
• Language: English
• Published: Korea (South) Korean Society for Preventive Medicine 01.01.2021; 대한예방의학회
• Subjects: Adult; Cross-Sectional Studies; Female; Humans; insomnia; Logistic Models; Male; night work; nurses; Nursing Staff, Hospital - psychology; Nursing Staff, Hospital - statistics & numerical data; Odds Ratio; Original; Republic of Korea; Severity of Illness Index; shift intensity; shift work; Shift Work Schedule - psychology; Shift Work Schedule - standards; Shift Work Schedule - statistics & numerical data; Sleep Initiation and Maintenance Disorders - diagnosis; Sleep Initiation and Maintenance Disorders - psychology; Surveys and Questionnaires; Workload - psychology; Workload - standards; 예방의학; Republic of Korea; Shift intensity; Insomnia; Night work; Nurses; Shift work
• ISSN: 1975-8375; 2233-4521
• DOI: 10.3961/jpmph.20.555

This study explored the relationship between shift intensity and insomnia among hospital nurses. The participants were 386 female hospital nurses who underwent a special health examination for night workers in 2015. The Korean Insomnia Severity Index (ISI), indices of shift work intensity, and other covariates such as amount of exercise, level of alcohol consumption, employment duration, and hours worked were extracted from the health examination data. The indices for shift intensity were (1) number of 3 consecutive night shifts and (2) number of short recovery periods after a previous shift, both assessed over the prior 3 months. Multiple logistic regression analysis adjusted for the aforementioned covariates was performed to evaluate the association of shift intensity with insomnia, defined as an ISI score of ≥8. The nurses with insomnia tended to be younger (p=0.029), to have worked 3 consecutive night shifts more frequently (p<0.001), to have experienced a greater number of short recovery periods after the previous shift (p=0.021), and to have worked for more hours (p=0.006) than the nurses without insomnia. Among the other variables, no statistically significant differences between groups were observed. Experiences of 3 or more consecutive night shifts (odds ratio [OR], 2.33; 95% confidence interval [CI], 1.29 to 4.20) and 3 or more short recovery periods (OR, 2.01; 95% CI, 1.08 to 3.73) were associated with increased odds of insomnia. The results suggest that decreasing the shift intensity may reduce insomnia among hospital nurses working rotating shifts.