Table 1 Baseline demographic and clinical characteristics of study subjects
Variable | Category | Preoperative anemia status | p-value | |
|---|---|---|---|---|
Anemic (n = 481), n (%) | Non-anemic (n = 478), n (%) | |||
Age (in years)a | 35 (25, 48) | 30 (22, 42) | < 0.001 | |
Sex | Male | 369 (76.72) | 367 (76.78) | 0.981 |
Female | 112 (23.28) | 111 (23.22) | ||
ASA physical status score | I/II | 454 (94.39) | 468 (97.91) | 0.004 |
III/IV | 27 (5.61) | 10 (2.09) | ||
Comorbidity | Yes | 117 (24.32) | 52 (10.88) | < 0.001 |
No | 364 (75.68) | 426 (89.12) | ||
Urgency of surgery | Elective | 193 (40.12) | 211 (44.14) | 0.207 |
Emergency | 288 (59.88) | 267 (55.86) | ||
Trauma | Yes | 345 (71.73) | 341 (71.34) | 0.894 |
No | 136 (28.27) | 137 (28.66) | ||
Type of anesthesia | General | 84 (17.46) | 86 (17.99) | 0.830 |
Regional | 397 (82.54) | 392 (82.01) | ||
Length of surgery | < 2 h | 351 (72.97) | 334 (69.87) | 0.288 |
≥ 2 h | 130 (27.03) | 144 (30.13) | ||
Bloss loss (milliliters) | < 500 | 406 (84.41) | 416 (87.03) | 0.246 |
≥ 500 | 75 (15.59) | 62(12.97) | ||
Blood transfusion | Yes | 83 (17.26) | 28 (5.86) | 0.027 |
No | 398 (82.74) | 450 (94.14) | ||