Nurse Staffing and Skill Mix Patterns in Relation to Resident Care Outcomes in US Nursing Homes

Objectives The purpose of this study was to identify patterns of nurse staffing and skill mix and estimate the impact of these patterns on rehospitalization and emergency department (ED) visits in nursing home (NH) residents. We also estimated the relative contribution of unique staffing patterns on variations in hospital and ED use rates. Design Retrospective secondary data analysis at the facility level, using administrative data. Setting and Participants Data from Medicare/Medicaid certified NHs in the 2018 Certification and Survey Provider Enhanced Reporting System were merged with the NH Compare Claims-Based Quality Measures file, for those facilities with complete data available (N = 14,325). Methods Cluster analysis was performed to identify groups of NHs with similar nursing skill mix patterns, using measures that captured hours per resident day (HPRD) for registered nurses (RNs), licensed practical nurses (LPNs), and certified nursing assistants (CNAs). We estimated the impact of cluster assignment on unplanned rehospitalization and ED visits using multivariate generalized estimating equations. Plots were generated to visualize simulation models that showed the relative contribution of unique staffing strategies to the outcomes, while holding other factors constant. Results We identified 3 nursing skill mix clusters: high-RN, high-LPN, and high-CNA, relative to national staffing averages. After controlling for regional and organizational characteristics, residents in NHs in the high-RN cluster had significantly lower rehospitalization and ED use compared with those in the high-LPN cluster, with a similar nonsignificant trend for the high-CNA vs high-LPN clusters. Though the high-RN cluster had CNA HPRD similar to the high-CNA cluster, it relied much less on LPN staffing. Whereas NHs in the high-LPN cluster had proportionally fewer hours of care by both CNAs and RNs. Conclusions and Implications NHs that emphasize LPN care in place of either RN or CNA care appears to exhibit higher rates of unplanned rehospitalization and ED visits among residents.