Table 4Hospital-related mortality rates corresponding to changes in patients/RN ratio (pooled weighted estimates from published studies)

Level of AnalysisNumber of StudiesChange in Death Rate, %Standard Errorp Value for the Associationp Value for Heterogeneity
Authors' definition of nurse to patient ratio
Increase by 1 patient/RN/shift30.0950.030.0030.33
Increase by 1 RN FTE/patient day3-1.241.130.3110.041
Increase by 1 RN FTE/1,000 patient days1-1.290.540.076
Estimated Increase by 1 RN FTE/patient day
All studies8-1.180.490.02<0.001
ICUs3-0.970.28<0.0010.23
Surgical patients5-0.890.490.08<0.001
Medical patients3-1.180.780.15<0.001
Hospital level analysis3-3.482.680.250.67
Patient level analysis5-1.180.550.04<0.001

From: 3, Results

Cover of Nurse Staffing and Quality of Patient Care
Nurse Staffing and Quality of Patient Care.
Evidence Reports/Technology Assessments, No. 151.
Kane RL, Shamliyan T, Mueller C, et al.

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