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Table 2 Characteristics of 162,466 index admissions

From: Comparison of predictive modeling approaches for 30-day all-cause non-elective readmission risk

  Overall index admissions
n = 162,466
Index admissions by the value of 30-day all-cause non-elective readmission
The total degrees of freedom = 24 No (88.5 %)
n = 143,759
Yes (11.5 %)
n = 18,707
  No. or Mean % or Std. No. or Mean % or Std. No. or Mean % or Std.
Variables in LACE model
 1. Length of Stay (L) 4.8 4.5 4.6 4.4 5.8 5.3
 2. Acuity (A) 123,426 76.0 107,288 74.6 16,138 86.3
 3. Charlson Comorbidity Index (C) 2.0 2.4 1.9 2.4 2.8 2.8
 4. ER encounters in Last Six Months (E) 33,166 20.4 27,368 19.0 5798 31.0
Additional variables from EMR
 5. Number of ER encounters in Last Year 0.6 2.0 0.5 1.5 1.1 4.1
  Index admissions with this value > 0 45,037 27.2 37,532 26.1 7505 40.1
 6. Number of Inpatient encounters in Last Year 1.0 1.8 0.8 1.6 2.1 2.9
  Index admissions with this value > 0 64,742 39.9 52,998 36.9 11,744 62.8
 7. Braden Score 18.6 3.3 18.7 3.2 17.9 3.4
 8. Polypharmacy 6.1 5.8 5.9 5.6 7.2 6.5
 9. Inpatient encounters in Last 6 Months 51,797 31.9 41,540 28.9 10,257 54.8
10. Employment Status       
 Employed 22,007 13.6 20,398 14.2 1609 8.6
 Not Employed 83,231 51.2 71,607 49.8 11,624 62.1
 Unknown 57,228 35.2 51,754 36.0 5474 29.3
11. Discharge Disposition       
 Home/Self care 89,620 55.2 81,757 56.9 7863 42.3
 Home Care 26,913 16.6 22,669 15.8 4244 22.7
 SNF 29,598 18.2 24,714 17.2 4884 26.1
 Rehab 4155 2.6 3780 2.6 375 2.0
 LTC, Federal Hospital 9734 6.0 8823 6.1 911 4.9
12. Against Medical Advice (AMA) 2163 1.3 1760 1.2 403 2.2
13. Albumin Level       
  < 3.4 g/dL 54,161 33.3 45,778 31.8 8383 44.8
  > = 3.4 g/dL (normal range) 34,077 21.0 30,744 21.4 3333 17.8
 Unknown 74,228 45.7 67,237 46.8 6991 37.4
14. Leukemia_LMM 3576 2.2 2940 2.1 636 3.4
15. Malignancy 17,384 10.7 14,471 10.1 2913 15.6
16. RF with Hemo 42,844 26.4 35,458 24.7 7386 39.5
17. History of Alcohol Substance Abuse 11,374 7.0 9686 6.7 1688 9.0
18. Dementia 5362 3.3 4688 3.3 674 3.6
19. Trauma 25,241 15.5 22,340 15.5 2901 15.5
  1. The independent variables were those being selected at least 95 % of the time in the three models: STEPWISE, LASSO and AdaBoost when the sample size of fitting data was around 80,000