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Updated: Mar 17, 2026
Assessment of Bone Fracture Healing Using Micro-Computed Tomography
Published on: December 9, 2022
Association between Nurse Staffing and In-Hospital Bone Fractures: A Retrospective Cohort Study
Kojiro Morita1, Hiroki Matsui1, Kiyohide Fushimi2
1Department of Clinical Epidemiology and Health Economics, School of Public Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
Objective:
To determine if sufficient nurse staffing reduced in-hospital fractures in acute care hospitals.
Data Sources/Study Setting:
The Japanese Diagnosis Procedure Combination inpatient (DPC) database from July 2010 to March 2014 linked with the Surveys for Medical Institutions.
Study Design:
We conducted a retrospective cohort study to examine the association of inpatient nurse-to-occupied bed ratio (NBR) with in-hospital fractures. Multivariable logistic regression with generalized estimating equations was performed, adjusting for patient characteristics and hospital characteristics.
Data Collection/Extraction Methods:
We identified 770,373 patients aged 50 years or older who underwent planned major surgery for some forms of cancer or cardiovascular diseases. We used ICD-10 codes and postoperative procedure codes to identify patients with in-hospital fractures. Hospital characteristics were obtained from the "Survey of Medical Institutions and Hospital Report" and "Annual Report for Functions of Medical Institutions."
Principal Findings:
Overall, 662 (0.09 percent) in-hospital fractures were identified. Logistic regression analysis showed that the proportion of in-hospital fractures in the group with the highest NBR was significantly lower than that in the group with the lowest NBR (adjusted odd ratios, 0.67; 95 percent confidence interval, 0.44-0.99; p = .048).
Conclusions:
Sufficient nurse staffing may be important to reduce postsurgical in-hospital fractures in acute care hospitals.
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