TABLE 4

Independent Risk Factors Associated With Inpatient Hospital Admission, 2006–2010

Predictor VariablesDischarge, % a Admission, % b Unadjusted OR (95% CI) c Adjusted OR (95% CI) d
Demographic factors
 Age
  <111.621.61.00 (ref)1.00 (ref)
  1–429.323.60.43 (0.42–0.44)0.43 (0.42–0.44)
  5–918.714.40.53 (0.51–0.56)0.46 (0.44–0.49)
  10–1840.440.40.41 (0.40–0.43)0.41 (0.40–0.43)
 Gender
  Male51.754.41.11 (1.10–1.12)1.14 (1.13–1.15)
  Female48.345.61.00 (ref)1.00 (ref)
 Insurance
  Public46.248.71.00 (ref)1.00 (ref)
  Private53.851.30.91 (0.86–0.96)1.05 (0.99–1.11)
 Time of visit
  Weekday68.871.41.00 (ref)1.00 (ref)
  Weekend31.128.60.88 (0.87–0.89)0.89 (0.88–0.90)
 Region
  Northeast18.520.11.00 (ref)1.00 (ref)
  Midwest23.622.60.90 (0.77–1.06)0.78 (0.67–0.91)
  South38.633.80.80 (0.69–0.91)0.61 (0.52–0.70)
  West19.323.51.10 (0.92–1.32)0.99 (0.84–1.16)
Clinical factors
 CCC
  No98.785.51.00 (ref)1.00 (ref)
  Yes1.314.513.39 (12.60–14.21)8.79 (8.05–9.60)
 No. of additional acute diagnoses
  155.925.81.00 (ref)1.00 (ref)
  2–338.443.02.45 (2.35–2.55)2.47 (2.36–2.58)
  4–54.918.38.28 (7.56–9.07)8.17 (7.45–8.97)
  >50.812.935.6 (30.42–41.88)30.19 (25.95–35.13)
 ADE
  No99.698.41.00 (ref)1.00 (ref)
  Yes0.41.63.86 (3.53–4.23)2.18 (2.04–2.32)
  • OR, odds ratio; CI, confidence interval.

  • a n = 136 877 158.

  • b n = 7 508 030.

  • c Overall type 3 effect for each variable in relation to the outcome was P < .01.

  • d Final model adjusted for age–gender, insurance type, presence of ADE, number of acute diagnoses, weekday, and regional location of ED.