of 82.0 minutes was reported by 64.6% of shift-working nurses.
A U-shaped relationship exists between social jetlag and (BMI) in shift-working nurses.
The inflection point for this relationship is identified at a BMI of 20.7.
For nurses with a BMI less than 20.7, increased social jetlag is significantly associated with lower BMI.
Conversely, for those with a BMI greater than 20.7, higher social jetlag correlates with increased BMI.
The findings suggest a need for targeted health interventions for both underweight and overweight shift-working nurses.
Simplified
This study aimed to explore the relationship between shift-working nurses' and (BMI) and provide a theoretical basis for nursing managers to develop appropriate health interventions. Shift work is unavoidable in nursing and is associated with circadian rhythm disorders. Social jetlag is prevalent in shift-working nurses and is associated with adverse health outcomes (particularly metabolism-related indicators). BMI is a significant metabolic indicator, and research has demonstrated its effectiveness in predicting the formation of metabolic syndrome. The relationship between social jetlag and BMI can be explained by considering physiological, psychological, and behavioral factors. However, most studies on social jetlag and health status are focused on non-shift nurse populations, with fewer studies on shift workers. Five tertiary hospitals located at similar latitudes in Southwest China were selected for the study. We surveyed 429 shift-working nurses using sociodemographic data, the Munich Chronotype Questionnaire for Shift Workers, and BMI. The restricted cubic spline model was used to analyze the relationship between social jetlag and BMI among shift-working nurses, and segmented linear regression was performed around the inflection point using multiple linear regression analysis. The results revealed that social jetlag (82.0 [85.0] min) was experienced by 64.6% of the shift-working nurses. After controlling for confounding variables, the model with seven knots had the lowest accepted Akaike information criterion value, and there was a U-shaped relationship between shift-working nurses' BMI and social jetlag in this model; its inflection (lowest) point of 20.7 was considered the cut-off point. Segmented regression showed that for BMI < 20.7, BMI was significantly negative with standardized social jetlag; whereas with BMI > 20.7, BMI was significantly positive with standardized social jetlag. BMI has a U-shaped relationship with social jetlag, and attention should be paid to overweight or underweight shift-working nurses to detect early circadian rhythm disorder. Shift-working nurses with high social jetlag tended to have higher/lower BMI, which should be further investigated in the future, to minimize metabolic diseases among them.
Key numbers
64.6%
Prevalence of
Percentage of shift-working nurses reporting .
82.0 (85.0) min
Average Duration
Mean duration measured in minutes.
20.7
Inflection Point
Cut-off point for in relation to .
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