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 |