TABLE 6

Patient and Hospital Characteristics Associated With Length of Hospitalization in a Multivariable Negative Binomial Regression Model

VariableAdjusted Rate Ratio95% CIP
Female vs male gender1.010.97–1.05.59
Per comorbid illness1.151.11–1.20<.01
Per dysfunctional organ system1.171.12–1.22<.01
APRDRG levels of illness severitya
    Minor or moderate0.270.24–0.30<.01
    Major0.540.50–0.57<.01
Source of admissionb
    Another hospital1.281.19–1.38<.01
    Routine/clinic1.091.02–1.16.01
Type of hospitalc
    Children's teaching and nonteaching     hospital1.431.31–1.56<.01
    Nonchildren's teaching hospital1.251.16–1.34<.01
Hospital bed sized
    Medium0.980.86–1.11.73
    Large1.050.95–1.16.32
Hospital location
    Urban vs rural1.281.20–1.38<.01
  • The adjusted rate ratio reflects the odds of the specified outcome compared with the reference category within the same variable, adjusted for the other outcome categories that appear here.

  • a Reference category was extreme illness severity.

  • b Reference category was the emergency department.

  • c Reference category was nonchildren's nonteaching hospital.

  • d Reference category was small hospital bed size.