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Table 1 Descriptive characteristics of 8-to-30-day vs. 7-day readmissions

From: Can we predict early 7-day readmissions using a standard 30-day hospital readmission risk prediction model?

  8-to-30-day Readmissions
N = 2747 (8.3%)
7-day
Readmissions
N = 1447 (4.4%)
P
Baseline factors
 Age in yearsb 65 (52–78) 66 (53–79) 0.04
 Widowa 465 (16.9) 245 (16.9) 0.97
 Medicaida 313 (11.4) 151 (10.4) 0.37
 ≥ 1 ED visit in past yeara 1024 (37.3) 540 (37.3) 0.99
 ≥ 1 hospitalization in past yeara 1301 (47.4) 627 (43.3) 0.01
Factors from admission day
 Nonelective admissiona 2447 (89.1) 1280 (88.4) 0.58
 Charlson Comorbidity Indexb 0 (0–3) 0 (0–3) 0.02
Laboratory abnormalities within 24 h of admission
  Albumin < 2 g/dLa 57 (2.1) 37 (2.6) 0.37
  Albumin 2–3 g/dLa 590 (21.5) 292 (20.2) 0.35
  Aspartate aminotransferase > 40 U/La 469 (17.1) 259 (17.9) 0.53
  Creatine phosphokinase < 60 mcg/La 400 (14.6) 213 (14.7) 0.93
  Mean corpuscular volume > 100 fL/red cella 184 (6.7) 71 (4.9) 0.03
  Platelets < 90 × 103/μLa 150 (5.5) 68 (4.7) 0.33
  Platelets > 350 × 103/μLa 369 (13.4) 182 (12.6) 0.46
  Prothrombin time > 35 sa 42 (1.5) 19 (1.3) 0.67
Factors from hospital stay
 Discharge to hospicea 17 (0.6) 14 (1.0) 0.29
Hospital complications
  Clostridium difficile infectiona 20 (0.7) 13 (0.9) 0.68
  Pressure ulcera 54 (2.0) 29 (2.0) 0.97
  Venous thromboembolisma 39 (1.4) 22 (1.5) 0.90
Factors from discharge day
Laboratory abnormalities at discharge
  Blood urea nitrogen > 20 mg/dLa 1134 (41.3) 634 (43.8) 0.12
  Sodium < 135 mEq/La 505 (18.4) 317 (21.9) 0.007
  Hematocrit <= 27%a 372 (13.5) 190 (13.1) 0.75
 ≥1 vital sign instability at dischargea 621 (22.6) 369 (25.5) 0.03
 Length of stayb 5 (3–8) 5 (3–8) 0.37
  1. Abbreviation: ED Emergency department
  2. a Denotes a binary variable, which is shown as number (%)
  3. b Denotes a numerical variable, which is shown as median (interquartile range)