Scheduled group compared with overall emergency group — postoperative outcomes
| Outcome | Scheduled group | Overall emergency group | p value |
|---|---|---|---|
| Adverse events per patient, mean ± SD | 0.3 ± 0.7 | 0.4 ± 0.8 | 0.03 |
| Risk of having any adverse events adjusted for age and diagnosis OR (95 % CI) | 1.00 (Ref.) | 1.79 (1.40–2.30) | < 0.001 |
| Types of adverse events, no. (%) | |||
| Surgical site infections | 12/1633 (0.7) | 8/653 (1.2) | 0.32 |
| Systemic infections including urinary tract infections | 104/1647 (6.3) | 76/655 (11.6) | < 0.001 |
| Neuropathic pain | 203/1647 (12.3) | 99/655 (15.1) | 0.08 |
| Delirium | 115/1647 (7.0) | 59/655 (9.0) | 0.11 |
| Dural tear | 198/1610 (12.3) | 60/612 (9.8) | 0.10 |
| Pneumonia | 24/1647 (1.5) | 25/655 (3.8) | 0.001 |
| Dysphagia | 18/1647 (1.1) | 16/655 (2.4) | 0.02 |
| Deep vein thrombosis | 0/263 (0.0) | 2/103 (1.9) | 0.08 |
| Pulmonary embolism | 5/263 (1.9) | 3/103 (2.9) | 0.69 |
| Neurologic deterioration | 15/263 (5.7) | 6/103 (5.8) | > 0.99 |
| Cord injury | 0/226 (0.0) | 0/59 (0.0) | NA |
| Nerve root injury | 3/226 (1.3) | 0/59 (0.0) | 0.61 |
| CSF leak meningocele | 4/262 (1.5) | 0/103 (0.0) | 0.33 |
| Hematoma | 6/263 (2.3) | 2/103 (1.9) | > 0.99 |
| Wound dehiscence | 6/263 (2.3) | 4/103 (3.9) | 0.48 |
| Hardware malposition | 28/226 (12.4) | 1/59 (1.7) | 0.01 |
| Massive blood loss/transfusion | 12/226 (5.3) | 1/59 (1.7) | 0.31 |
CI = confidence interval; CSF = cerebrospinal fluid; NA = not applicable; OR = odds ratio; Ref. = reference; SD = standard deviation.
Differing denominators indicates missing data for some patients in some categories.