| Characteristic | Total
| No adverse outcome
| Any adverse outcome
| value |
| Age, median (IQR) | 65 (55, 75) | 66 (57, 78) | 64 (47, 71) | 0.096 | Sex | | | | | Male, (%) | 74 (60.2) | 37 (56.9%) | 37 (63.8%) | 0.437 | Previous admission with LGIB, (%) | 40 (32.5) | 13 (20.0%) | 27 (46.6%) | 0.002 | Comorbidities | | | | | Heart disease | 34 (27.6) | 21 (32.3%) | 13 (22.4%) | 0.221 | Stroke | 14 (11.4) | 6 (9.2%) | 8 (13.8%) | 0.426 | Pulmonary disease | 2 (1.6) | 1 (1.5%) | 1 (1.7%) | >0.999 | Liver disease | 3 (2.4) | 1 (1.5%) | 2 (3.4%) | 0.601 | Renal disease | 5 (4.1) | 3 (4.6%) | 2 (3.4%) | >0.999 | Hypertension | 53 (43.1) | 26 (40.0%) | 27 (46.6%) | 0.464 | Diabetes | 70 (56.9) | 34 (52.3%) | 36(62.1%) | 0.443 | Cancer | 14 (11.4) | 6 (9.2%) | 8 (13.8%) | 0.426 | Past medical history of colorectal polyps | 8 (6.5) | 4 (6.2%) | 4 (6.9%) | >0.999 | Preadmission medications | | | | 0.069 | Aspirin | 12 (9.8) | 10 (15.4%) | 2 (3.4%) | | Clopidogrel | 7 (5.7) | 5 (7.7%) | 2 (3.4%) | | Dual antiplatelet | 2 (1.6) | 1 (1.5%) | 1 (1.7%) | | Warfarin | 2 (1.6) | 1 (1.5%) | 1 (1.7%) | | NSAIDs | 2 (1.6) | 0 (0.0%) | 2 (3.4%) | | Corticosteroid | 1 (0.8) | 1 (1.5%) | 0 (0.0%) | | Presenting signs and symptoms | | | | | Clear red bloody stool in the ED | 32 (26.0) | 8 (12.3%) | 24 (41.4%) | <0.001 | Blood on DRE | 56 (45.5) | 29 (44.6%) | 27 (46.6%) | 0.83 | Heart rate (bpm) | 77 (72,84) | 77 (72, 80) | 78 (71, 88) | 0.078 | SBP (mmHg) | 130 (118,142) | 133 (120, 148) | 127 (114, 137) | 0.106 | Laboratory data at admission | | | | | White blood cell count (10⁹/L) | 5.93 (4.55,7.20) | 5.80 (4.50, 6.90) | 6.15 (4.63, 7.28) | 0.312 | Hemoglobin (g/L) | 114 (88,132) | 122 (110, 138) | 89 (67, 122) | <0.001 | Hematocrit (%) | 35 (28,40) | 37 (33, 41) | 28 (22, 36) | <0.001 | Platelet (10⁹/L) | 215 (165,262) | 212 (165, 260) | 215 (164, 261) | 0.966 | BUN (mmol/L) | 5.05 (3.81,6.26) | 4.98 (3.93, 5.80) | 5.41 (3.77, 6.47) | 0.78 | Creatinine (μmol/L) | 76 (58,89) | 77 (62, 90) | 72 (57, 86) | 0.186 | Albumin (g/L) | 38.9 (36.0,42.3) | 40.3 (37.4, 42.5) | 37.9 (33.9, 41.6) | 0.017 | INR | 1.07 (0.99,1.12) | 1.03 (0.97, 1.08) | 1.11 (1.06, 1.17) | <0.001 |
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