TABLE 2.

Results of Linear Regression of LOS (Days)

Covariate<3 Months3–11 Months
Mean Difference95% CIMean Difference95% CI
Age, mo−0.29*−0.38 to −0.20−0.09*−0.10 to −0.07
Male−0.09−0.19 to 0.00−0.12−0.20 to −0.03
APR-DRG severity level
    MildReferentReferent
    Moderate0.99*0.87 to 1.110.82*0.71 to 0.92
    Severe3.52*3.31 to 3.723.54*3.36 to 3.72
Medicaid0.09−0.01 to 0.190.110.02 to 0.20
Month
    January to FebruaryReferentReferent
    March to September−0.18−0.29 to −0.07−0.22*−0.32 to −0.13
    October to November−0.03−0.21 to 0.14−0.100.24 to 0.04
Testing
    Chest radiograph0.34*0.22 to 0.460.30*0.19 to 0.40
    RSV0.08−0.04 to 0.200.150.05 to 0.25
    Blood culture0.190.06 to 0.320.34*0.23 to 0.45
    CSF culture−0.08−0.28 to 0.110.13−0.25 to 0.51
    Nasopharyngeal culture0.47*0.28 to 0.650.54*0.32 to 0.76
    Urine culture0.44*0.29 to 0.600.55*0.40 to 0.70
Medications
    Parenteral antibiotics0.59*0.46 to 0.730.43*0.32 to 0.54
    Oral antibiotics0.48*0.33 to 0.620.35*0.25 to 0.44
    β2-agonist bronchodilators0.50*0.38 to 0.620.25*0.14 to 0.36
    Racemic epinephrine0.92*0.78 to 1.060.77*0.65 to 0.89
    Inhaled steroids1.77*1.42 to 2.111.08*0.92 to 1.24
    Systemic steroids1.26*1.10 to 1.430.68*0.58 to 0.78
  • Results are also adjusted for clustering by participating hospital.

  • * P < .001.

  • P < .01.

  • P < .05.