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Table 1 Baseline cohort characteristics of 35,156 index admissions

From: Identifying patients at highest-risk: the best timing to apply a readmission predictive model

Characteristics Index admission N = 35,156 No readmission N = 28,223 (80.3%) Readmission N = 6933 (19.7%) P value
Age, y, mean (SD) 78.9 (8.2) 78.8 (8.2) 79.3 (8.1) < 0.001
Male, n (%) 16,855 (47.9%) 13,413 (47.5%) 3442 (49.6%) 0.002
Socioeconomic status, n (%)
 Low 7135 (20.6%) 5470 (19.7%) 1665 (24.3%) < 0.001
 Medium 15,270 (44.0%) 12,288 (44.1%) 2982 (43.5%)  
 High 12,288 (35.4%) 10,075 (36.2%) 2213 (32.3%)  
Ethnicity, n (%)
 Jewish 31,083 (88.4%) 25,144 (89.1%) 5939 (85.7%) < 0.001
 Arabs 4073 (11.6%) 3079 (10.9%) 994 (14.3%)  
Before index admission
 CHF, n (%) 10,964 (31.2%) 8175 (29.0%) 2789 (40.2%) < 0.001
 COPD, n (%) 7879 (22.4%) 5957 (21.1%) 1922 (27.7%) < 0.001
 CRF, n (%) 11,314 (32.2%) 8513 (30.2%) 2801 (40.4%) < 0.001
 Malignancy, n (%) 10,486 (29.8%) 8163 (28.9%) 2323 (33.5%) < 0.001
 Arrhythmia, n (%) 14,842 (42.2%) 11,551 (40.9%) 3291 (47.5%) < 0.001
 Disability, n (%) 11,742 (33.4%) 8680 (30.8%) 3062 (44.2%) < 0.001
 Oncology (treatment phase), n (%) 6064 (17.2%) 4648 (16.5%) 1416 (20.4%) < 0.001
 Body mass indexa, mean (SD) 28.2 (6.1) 28.3 (6.0) 27.9 (6.3) < 0.001
 No. hospital admissions in the past year, mean (SD) 1.6 (2.2) 1.3 (1.9) 2.6 (2.9) < 0.001
 No. primary care and specialist visits in the past year, mean (SD) 16.6 (13.4) 16.3 (13.0) 17.6 (15.0) < 0.001
 Residing in hospitals’ catchment area, n (%) 65–4342 (0.2–12.4) 51–3541 (0.2–12.5) 14–982 (0.2–13.4) < 0.001
 No. days from last hospitalization, mean (SD) 205 (150) 219 (148) 147 (144.6) < 0.001
During index admission
 Index admission LOS, days, mean (SD) 5.3 (5.7) 5.2 (5.7) 5.9 (5.8) < 0.001
 Procedure, n (%) 1956 (5.6%) 1645 (5.8%) 311 (4.5%) < 0.001
 Index admission type: urgent, n (%) 34,119 (97.1%) 27,312 (96.8%) 6807 (98.2%) < 0.001
 Hemoglobin levelb (last) < 12 g/dL, n (%) 20,355 (58.0%) 15,607 (55.5%) 4748 (68.6%) < 0.001
 Sodium levelc (last) < 135 mEq/L, n (%) 5187 (14.8%) 3912 (13.9%) 1275 (18.4%) < 0.001
  1. Abbreviations: y years, SD Standard deviation, CHF Congestive heart failure, COPD Chronic obstructive pulmonary disease, CRF Chronic renal failure, No Number, LOS Length of stay, Procedure any ICD-9 coded procedure, such cardiac catheterization, or diagnostic radiology
  2. aMissing values contributed to 0.8%
  3. bMissing values contributed to 0.3%
  4. cMissing values contributed to 0.2%