TABLE 2

Adjusted Odds Ratios for Individual Predictors Included in Each Model

PredictorModel
Full, n = 1839Reduced, n = 2238EHR, n = 1902
Age, ya
 11.22 (1.02–1.46)1.29 (1.14–1.45)1.23 (1.10–1.38)
 2RefRefRef
 50.84 (0.62–1.15)0.84 (0.69–1.03)0.83 (0.68–1.01)
 101.87 (1.16–3.02)2.46 (1.74–3.47)1.84 (1.33–2.56)
Female sex0.79 (0.62–1.02)0.86 (0.68–1.09)
Race/ethnicity
 Non-Hispanic whiteRefRef
 Non-Hispanic black1.04 (0.72–1.50)0.82 (0.62–1.10
 Hispanic0.84 (0.60–1.19)0.91 (0.66–1.25)
 Other0.77 (0.49–1.23)0.80 (0.52–1.23)
No. comorbidities
 0RefRef
 11.04 (0.78–1.41)1.13 (0.87–1.46)
 21.37 (0.91–2.06)1.38 (0.95–2.0)
 3+1.93 (1.09–3.44)2.26 (1.31–3.90)
Household smoke exposure1.22 (0.94–1.59)
Season
 SpringRef
 Summer1.09 (0.75–1.60)
 Fall0.86 (0.59–1.26)
 Winter1.0 (0.74–1.36)
Symptom duration, da
 11.04 (1.0–1.08)
 3Ref
 60.95 (0.89–1.01)
Vomiting/feeding refusal0.83 (0.65–1.06)
Temperature, Ca
 352.0 (1.54–2.59)2.23 (1.76–2.83)
 37RefRef
 390.50 (0.39–0.65)0.45 (0.35–0.57)
Respiratory rate,a 50th (ref) vs 95th percentile at:
 1 y0.73 (0.52–1.01)0.99 (0.85–1.16)1.02 (0.87–1.19)
 2 y0.76 (0.44–1.33)1.21 (1.0–1.46)1.19 (0.98–1.44)
 5 y1.35 (0.82–2.24)1.44 (1.20–1.73)1.36 (1.13–1.63)
 10 y1.30 (0.87–1.94)1.53 (1.31–1.80)1.45 (1.23–1.70)
Heart rate,a 50th (ref) vs 95th percentile at:
 1 y1.59 (0.98–2.59)1.70 (1.35–2.15)1.94 (1.49–2.51)
 2 y1.59 (0.99–2.57)1.59 (1.27–1.99)2.10 (1.62–2.71)
 5 y1.99 (0.99–3.98)1.43 (0.99–2.05)2.41 (1.63–3.57)
 10 y2.90 (1.45–5.78)1.79 (1.25–2.57)2.84 (1.93–4.18)
Systolic blood pressure,a 50th (ref) vs 5th percentile at:
 1 y1.34 (1.03–1.75)1.13 (0.99–1.29)1.15 (1.0–1.31)
 2 y1.28 (0.96–1.69)1.03 (0.91–1.17)1.06 (0.94–1.20)
 5 y1.37 (0.81–2.33)0.91 (0.73–1.13)0.95 (0.76–1.19)
 10 y1.76 (1.15–2.68)1.0 (0.86–1.18)1.01 (0.86–1.19)
PF ratioa
 450Ref
 3002.57 (2.05–3.20)2.84 (2.34–3.44)3.44 (2.84–4.17)
 2003.43 (2.40–4.90)4.29 (3.13–5.89)5.64 (4.14–7.69)
Altered mental status7.42 (3.74–14.72)11.9 (6.41–22.23)
Chest indrawing1.77 (1.31–2.41)2.12 (1.62–2.78)
Asymmetric breath sounds0.86 (0.65–1.15)
Wheezing1.12 (0.85–1.48)
White blood cell count,a per mm3
 50001.09 (0.92–1.29)1.09 (0.93–1.28)
 15 000Ref
 30 0000.88 (0.68–1.14)0.88 (0.69–1.11)
Infiltrate pattern
 Consolidation, single lobarRefRef
 Consolidation, multilobar or other2.06 (1.39–3.06)1.63 (1.13–2.34)
 Other infiltrate1.82 (1.22–2.73)1.42 (1.0–2.02)
 Mixed1.64 (0.93–2.91)1.23 (0.72–2.09)
Pleural effusion1.31 (0.88–1.95)1.36 (0.95–1.94)
  • —, variables not included in the selected model.

  • a Denotes a continuous predictor: to calculate aORs for these predictors, ≥1 value was selected for comparison against a reference value; for predictors that included an interaction term with age (heart rate, respiratory rate, and systolic blood pressure), the 50th percentile value was compared with the 95th percentile (heart rate and respiratory rate)20 or 5th percentile (systolic blood pressure)21 value at 1, 2, 5, and 10 y of age.