AbstractAimTo examine the impact of application of different nursing staffing models on patient safety, quality of care and nursing costs.BackgroundOne proposed means of addressing the staff shortage while decreasing nursing costs is the application of nursing staffing models. However, the optimal proportion of registered nurses to nurse aides remains unclear.DesignA retrospective cohort study.MethodsTo examine a total of 667 inpatients of a 20‐bed respiratory care centre at a medical centre located in southern Taiwan. Three mixed models of nursing staffing, where the portion of nurses compared with nurse aides was 76% (n = 213), 100% (n = 209) and 92% (n = 245), were applied during three different periods between 2006 – 2010.ResultsThe 76% RNs group made fewer medication errors than the 100% RNs group; the 76% and 92% RNs groups had a higher rate of urinary tract infections; the 92% RNs group had a lower rate of bloodstream infections; the 76% RNs group had a lower rate of ventilator weaning; and the 76% and 92% RNs groups incurred higher nursing costs.ConclusionsUse of different nursing staffing models that substitute nurse aides for RNs may negatively affect patient safety and q
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