Improving nurse-to-patient staffing ratios as a cost-effective safety intervention.
BACKGROUND
Responding to research confirming the link between nurse staffing and patient outcomes, 14 states have introduced legislation to limit patient-to-nurse ratios. However, increased staffing places a considerable financial burden on hospitals.


OBJECTIVE
We sought to determine the cost-effectiveness of various nurse staffing ratios.


METHODS
This was a cost-effectiveness analysis from the institutional perspective comparing patient-to-nurse ratios ranging from 8:1 to 4:1. Cost estimates were drawn from the medical literature and the Bureau of Labor Statistics. Patient mortality and length of stay data for different ratios were based on 2 large hospital level studies. Incremental cost-effectiveness was calculated for each ratio and sensitivity and Monte Carlo analyses performed.


METHODS
The study included general medical and surgical patients.


METHODS
: We sought to measure costs per life saved in 2003 US dollars. RESULTS OF BASE CASE ANALYSIS: Eight patients per nurse was the least expensive ratio but was associated with the highest patient mortality. Decreasing the number of patients per nurse improved mortality and increased costs, becoming progressively less cost-effective as the ratio declined from 8:1 to 4:1. Nonetheless, the incremental cost-effectiveness did not exceed US dollars 136,000 (95% CI US dollars 53,000-402,000) per life saved.


RESULTS
The model was most sensitive to the effects of patient-to-nurse ratios on mortality. Lower ratios were most cost-effective when lower ratios shortened length of stay, and hourly wages were low. However, throughout the ranges of all these variables, the incremental cost-effectiveness of limiting the ratio to 4:1 never exceeded US dollars 449,000 per life saved.


CONCLUSIONS
As a patient safety intervention, patient-to-nurse ratios of 4:1 are reasonably cost-effective and in the range of other commonly accepted interventions.
Rothberg
Michael B
MB
Division of General Medicine and Geriatrics, Department of Medicine, Baystate Medical Center, Springfield, Massachusetts 01199, USA. Michael.Rothberg@bhs.org
Abraham
Ivo
I
Lindenauer
Peter K
PK
Rose
David N
DN
D003362:Cost-Benefit Analysis; D017052:Hospital Mortality; D006801:Humans; D007902:Length of Stay / Q000191:economics; D009741:Nursing Staff, Hospital / Q000191:economics* / Q000331:legislation & jurisprudence / Q000706:statistics & numerical data; D011787:Quality of Health Care / Q000191:economics*; D012449:Safety