Table 4

Mixed-effects Poisson regression: association between staffing and high acuity missed observations with (A) and without (B) inclusion of a linear interaction term between RN and NA staffing levels

IRR95% CIP valueIRR95% CIP value
RN staffing0.9820.972 to 0.992<0.0010.9820.972 to 0.992<0.001
NA staffing10.990 to 1.010.82210.991 to 1.010.791
Patient turnover0.9970.988 to 1.010.590.9970.988 to 1.010.582
Observations in higher acuity patients1.010.936 to 1.090.7691.010.937 to 1.090.747
RN staffing × NA staffing0.9990.994 to 1.000.64
  • Model A: AIC 76747; BIC 76796. Model B: AIC 76749; BIC 76806.

  • AIC, Akaike information criterion; BIC, Bayesian information criterion; IRR, incidence rate ratio; NA, nursing assistant; RN, registered nurse.