Table 2.
Baseline and operative characteristics of all patients stratified by transfusion requirement.
| Parameter | No Transfusion | Transfusion | p-Value |
|---|---|---|---|
| Age (mean, standard deviation) | 54.1 (19.2) | 57.2 (18.6) | 0.005 * |
| Sex | |||
| Male | 231 (39.4%) | 204 (34.8%) | 0.107 |
| Female | 356 (60.6%) | 382 (65.2%) | |
| ASA Class | |||
| 1 | 38 (6.5%) | 18 (3.1%) | <0.001 * |
| 2 | 244 (41.6%) | 176 (30.0%) | |
| 3 | 294 (50.1%) | 372 (63.5%) | |
| 4 | 11 (1.9%) | 20 (3.4%) | |
| Smoker | 102 (17.4%) | 73 (12.5%) | 0.018 * |
| Chronic steroid use | 23 (3.9%) | 33 (5.6%) | 0.169 |
| Bleeding disorder | 12 (2.0%) | 23 (3.9%) | 0.058 |
| Dependent functional status | 15 (2.6%) | 47 (8.0%) | <0.001 * |
| Body weight (mean kg, standard deviation) | 79.3 (20.9) | 76.3 (20.9) | 0.016 * |
| Preoperative hematocrit (mean, standard deviation) | 41.2 (4.4) | 39.9 (4.6) | <0.001 * |
| Orthopedic surgeon as attending | 327 (55.7%) | 290 (49.5%) | 0.033 * |
| Surgery duration (mean hours, standard deviation) | 4.4 (2.3) | 7.1 (2.4) | <0.001 * |
| Pelvic fixation | 43 (7.3%) | 207 (35.3%) | <0.001 * |
| Interbody graft | 147 (25.0%) | 107 (18.3%) | 0.005 * |
| Any osteotomy | 114 (19.4%) | 231 (39.4%) | <0.001 * |
| 3CO | 63 (10.7%) | 166 (28.3%) | <0.001 * |
| 6–12 posterior levels fused | 163 (27.8%) | 100 (17.1%) | <0.001* |
| 13+ posterior levels fused | 63 (10.7%) | 177 (30.2%) | <0.001 * |
| Revision surgery | 41 (7.0%) | 78 (13.3%) | <0.001 * |
* statistically significant result.