TABLE 2.
Univariate analyses identifying potential predictors of prolonged length of stay and respiratory complications.
| Prolonged length of stay | Respiratory complications | |||||
| No./total (%) | No./total (%) | |||||
| Characteristic | No (n = 870) | Yes (n = 260) | P-value | No (n = 1,097) | Yes (n = 33) | P-value |
| Age, mean (SD), years | 57.0 (16.0) | 61.6 (16.5) | <0.001 | 58.0 (16.2) | 59.4 (18.2) | 0.677 |
| Female sex | 509/870 (58.5) | 159/259 (61.4) | 0.407 | 644/1,096 (58.8) | 24/33 (72.7) | 0.108 |
| BMI, mean (SD), kg/m2 | 30.3 (7.2) | 30.8 (7.9) | 0.433 | 30.4 (7.3) | 31.5 (7.5) | 0.417 |
| COPD | 59/870 (6.8) | 16/260 (6.2) | 0.721 | 72/1,097 (6.6) | 3/33 (9.1) | 0.565 |
| Diabetes | 165/870 (19.0) | 68/260 (26.2) | 0.012 | 221/1,097 (20.1) | 12/33 (36.4) | 0.023 |
| Hypertension | 388/870 (44.6) | 123/260 (47.3) | 0.441 | 498/1,097 (45.4) | 13/33 (39.4) | 0.495 |
| Preoperative hemoglobin, mean (SD), g/dL | 13.6 (1.9) | 13.1 (1.9) | 0.001 | 13.5 (1.9) | 13.4 (2.2) | 0.742 |
| Preoperative creatinine, mean (SD), mg/dL | 0.9 (0.4) | 0.9 (0.6) | 0.164 | 0.9 (0.5) | 0.9 (0.3) | 0.503 |
| ASA 3 or 4 | 399/870 (45.9) | 157/260 (60.4) | <0.001 | 535/1,097 (48.8) | 21/33 (63.6) | 0.092 |
| Case duration, mean (SD), h | 3.4 (2.5) | 4.5 (2.2) | <0.001 | 3.6 (2.5) | 4.5 (2.3) | 0.053 |
| EBL, mean (SD), L | 0.4 (0.4) | 0.9 (1.0) | <0.001 | 0.5 (0.6) | 0.9 (1.1) | 0.051 |
| Surgical service: spine | 700/870 (80.5) | 212/260 (81.5) | 0.699 | 883/1,097 (80.5) | 29/33 (87.9) | 0.289 |
| SARS-CoV-2 result | 25/870 (2.9) | 5/260 (1.9) | 0.403 | 29/1,097 (2.6) | 1/33 (3.0) | 0.892 |
ASA, American Society of Anesthesiologists; BMI, body mass index; COPD, chronic obstructive pulmonary disease; EBL, estimated blood loss.