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. 2020 Jul 9;15(7):e0235754. doi: 10.1371/journal.pone.0235754

Table 2. Adjusted associations between the characteristics of 340 US hospitals and rates of methicillin-resistant Staphylococcus aureus (HA-MRSA) infections for discharges between September 2015 and August 2016.

Variable Adjusted Incidence Rate Ratio (aIRR)* 95% Confidence Interval of aIRR p-value*
Lower Bound Upper Bound
PPR (%) 0.992 0.991 0.994 <0.001
Teaching facility 1.257 1.102 1.434 0.001
Rural location (%) 1.072 0.918 1.252 0.380
Ownership type (%)
    For-Profit 1.000 (ref)
    Public 1.235 1.070 1.425 0.004
    Non-Profit 1.129 1.021 1.250 0.019
# Licensed beds (log-transformed) 1.616 1.524 1.713 <0.001
Publicly insured or uninsured patients (%) 1.003 1.000 1.006 0.049
Hispanic patients (%) 1.000 0.998 1.002 0.949
Black patients (%) 1.006 1.001 1.010 0.009
Physical space per bed in square feet (log-transformed) 0.941 0.885 1.002 0.056
Mean Elixhauser score 1.034 1.002 1.068 0.038
Nurse-to-patient ratio (log-transformed) 0.536 0.892 0.356 <0.001
Major therapeutic procedures (%) 1.007 1.004 1.011 <0.001
Occupancy rate (%) 1.012 1.009 1.016 <0.001

PPR, private patient room.

* Adjusted incidence rate ratios and p-values were generated using a multivariable negative binomial logistic regression model.