Objectives
To determine the association between nurse staffing and postsurgical outcomes, including 30-day mortality and failure-to-rescue among older black patients.
Design and Setting
A cross-sectional study of University of Pennsylvania Multi-State Nursing Care & Patient Safety Survey data, linked to 2006–07 administrative patient discharge data from four states (CA, PA, NJ, FL), American Hospital Association Annual Survey data, and a U.S. Census-derived measure of socioeconomic status (SES). Risk-adjusted logistic regression models with correction for clustering were used for the analysis.
Participants
Patients age 65 and over having general, orthopedic and vascular surgeries. Our final sample included 548,397 patients: 94% white and 6% black.
Measurements and Results
In models adjusting for sex and age, 30-day mortality was significantly higher for black than white patients [Odds Ratio (OR)=1.42, 95% confidence interval (CI) 1.32–1.52]. In fully adjusted models that accounted for patient SES, surgery type, and comorbidities, as well as hospital characteristics, including nurse staffing, the odds of 30-day mortality were not significantly different for black than white patients. In the fully adjusted models, one additional patient in the average nurse’s workload was associated with higher odds of 30-day mortality for all patients [OR 1.03, 95% CI 1.01–1.05]. We detected a significant interaction between race and nurse staffing for 30-day mortality, such that blacks experienced higher odds of death with each additional patient per nurse (OR=1.10; 95% CI 1.03–1.18) compared to whites (OR=1.03; 95% CI 1.01–1.06). Similar patterns were detected in failure-torescue models.
Conclusion
Older surgical patients experience poorer post surgical outcomes, including mortality and failure-to-rescue, when cared for by nurses with higher workloads. The impact of nurse staffing inadequacies is more significant in older black patients.