Research Article
Impact of Preoperative Anemia on Perioperative Outcomes in Patients Undergoing Elective Colorectal Surgery
| | Clinical features | Total (n, %) | Anemia group (n, %) | Nonanemia group (n, %) | value |
| | Patients | 326 | 154 | 172 | | | Age (years) | | | | 0.20 | | ≤65 years | 197 (60%) | 87 (57%) | 110 (64%) | | | >65 years | 129 (40%) | 67 (43%) | 62 (36%) | | | Gender (male/female) | | | | <0.01 | | Males | 191 (59%) | 61 (40%) | 130 (73%) | | | Females | 135 (41%) | 93 (60%) | 42 (27%) | | | BMI (kg/m2) | | | | 0.14 | | <25 | 285 (87%) | 139 (90%) | 146 (85) | | | ≥25 | 41 (13%) | 15 (10%) | 26 (15%) | | | RBC (×1012/L)† | 4.2 (3.8–4.6) | 3.8 (3.5–4.0) | 4.5 (4.3–4.7) | <0.01 | | Hemoglobin (HB, g/dl) | 12.1 (10.4–13.5) | 10.4 (9.1–11.2) | 13.4 (12.7–14.3) | <0.01 | | Location of cancer | | | | <0.01 | | Colon | 141 (43%) | 93 (60%) | 38 (22%) | | | Rectum | 195 (57%) | 61 (40%) | 134 (78%) | | | ASA classification | | | | 0.13 | | ASA-1/2 | 309 (6%) | 149 (97%) | 160 (93%) | | | ASA-3 | 17 (89%) | 5 (3%) | 12 (7%) | | | Comorbidities | | | | | | Hypertension | 75 (23%) | 48 (31%) | 27 (16%) | <0.01 | | Diabetes | 30 (9%) | 16 (10%) | 13 (7%) | 0.47 | | Cardiac diseases | 14 (4%) | 9 (6%) | 5 (3%) | 0.19 | | Respiratory diseases | 12 (4%) | 4 (3%) | 8 (5%) | 0.33 | | Renal diseases | 2 (0.6%) | 1 (0.7%) | 0 (0%) | 0.47 | | Cerebral diseases | 7 (2%) | 4 (3%) | 3 (2%) | 0.71 | | Abdominal surgical history | 54 (17%) | 25 (16%) | 29 (17%) | 0.52 |
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†RBC: red blood cells.
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