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Table 1 Study patient characteristics

From: Roles of disease severity and post-discharge outpatient visits as predictors of hospital readmissions

  Readmission No (N = 49,521) Readmission Yes (N = 6011)
Demographics
 Mean Age --- year, (SD)*** 44.5 (16.6) 49.3 (15.1)
 Median Age --- year, (IQR)*** 44 (30–57) 51 (38–60)
 Male sex --- n, (%)*** 19,367 (39) 3017 (50)
 Marital status --- n, (%)***c   
  Single --- n, (%) 23,435 (47) 3028 (50)
  Married --- n, (%) 16,138 (33) 1560 (26)
  Divorced --- n, (%) 4191 (8) 659 (11)
 Race and ethnic groupc   
  Black --- n, (%)*** 11,826 (24) 1907 (32)
  White --- n, (%) 20,970 (42) 2489 (41)
  Hispanic --- n, (%)*** 18,444 (37) 1626 (27)
Clinical Variables
 Mean LOS -- days, (SD)*** 5 (8) 7 (8)
 Mean SOI --- n, (SD)*** 2.1 (0.9) 2.6 (0.9)
 Median SOI --- n, (IQR)*** 2 (1–3) 3 (2–3)
 Mean ROM --- n, (SD) *** 1.6 (0.9) 2.1 (0.9)
 Median ROM --- n, (IQR)*** 1 (1–2) 2 (1–3)
 Disposition --- n, (%)***c   
  Home 41,998 (85) 4887 (81)
  Other facilityb 3582 (7) 545 (9)
 Insurance Payers --- n, (%)***c
  No insurance 9320 (19) 859 (14)
  Medicare 7830 (16) 1251 (21)
Acute substance abuse 1999 (4) 257 (4)
History of psychiatric disorder(s)** 4296 (9) 593 (10)
Homeless*** 1877 (4) 343 (6)
Primary care physician assignment --- n, (%)*** 23,517 (47) 3593 (60)
Mean number of index discharge diagnoses --- n, (%)*** 6 (6) 9 (7)
Median number of index discharge diagnoses --- n, (IQR)*** 4 (1–9) 8 (4–13)
Mean number of medications prescribed upon index discharge --- n, (%)*** 4 (4) 3 (4)
Median number of medications prescribed upon index discharge --- n, (IQR)*** 3 (2–5) 2 (1–5)
Prescription Ratio --- (SD)***a 1.4 (1.5) 0.5 (0.9)
Prescription Ratio --- (median, IQR)***a 0.8 (0.3–2) 0.3 (0.1–0.7)
Prescription Ratio ≥ 0.5 --- (n, %)***a 32,325 (74) 2098 (45)
At least one ED/UCC/Clinic visit within 30 days after index discharge --- n, (%)***d 23,265 (47) 5699 (95)
At least one ED/UCC visit within 30 days from index discharge --- n, (%)***d 7232 (15) 5601 (93)
Days between first ED/UCC visit and index discharge (Mean, SD)***d 11.4 (8.7) 10.8 (7.8)
Days between first ED/UCC visit and index discharge (Median, IQR)d 9 (4–18) 9 (4–16)
At least one clinic visit within 30 days from index discharge --- n, (%)***d 20,218 (41) 2004 (33)
Days between first clinic visit and index discharge (Mean, SD)***d 10.9 (7.2) 7.3 (5.3)
Days between first clinic visit and index discharge (Median, IQR)***d 10 (5–15) 6 (3–11)
  1. Abbreviations: SD standard deviation; LOS length of stay; SOI refers to All Patient Refined Diagnosis Related Groups Severity of Illness; ROM refers to All Patient Refined Diagnosis Related Groups Risk of Mortality; IQR interquartile range
  2. **p < 0.01, ***p < 0.001
  3. aPrescription Ratio refers to the number of medications prescribed upon index discharge divided by the number of index discharge diagnoses
  4. bOther facilities includes: discharge to long term care, nursing, skilled nursing, short term hospital, and rehabilitation facilities
  5. cOther groups divided under these categories were not shown in this table
  6. dED/UCC/Clinic only counts within 30 days after the index discharge (no readmission group) or prior to readmission (readmission group)