Table 2.
Baseline Patient Characteristics.
| N (% of patients) | |
|---|---|
| Age | |
| 18–44 | 164 (26.3%) |
| 45–54 | 103 (16.5%) |
| 55–64 | 143 (23.0%) |
| 65–74 | 154 (24.7%) |
| 75+ | 59 (9.5%) |
| Sex | |
| Female | 281 (45.1%) |
| Male | 342 (54.9%) |
| Body mass index | |
| <18.5 | 7 (1.1%) |
| 18.5–24.9 | 148 (23.8%) |
| 25.0–29.9 | 237 (38.0%) |
| 30.0–34.9 | 127 (20.4%) |
| 35.0–39.9 | 68 (10.9%) |
| ≥40.0 | 36 (5.8%) |
| Charlson Comorbidity Index score | |
| CCI 0 | 136 (21.8%) |
| CCI 1 | 117 (18.8%) |
| CCI 2 | 121 (19.4%) |
| CCI 3 | 111 (17.8%) |
| CCI 4 | 62 (10.0%) |
| CCI 5+ | 76 (12.2%) |
| American Society of Anesthesiology class | |
| ASA 1 | 77 (12.4%) |
| ASA 2 | 380 (61.0%) |
| ASA 3 | 164 (26.3%) |
| ASA 4 | 0 (0.0%) |
| ASA 5 | 1 (0.2%) |
| Three most common diagnoses | |
| Lumbar disc herniation | 204 (32.7%) |
| Lumbar stenosis | 169 (27.1%) |
| Cervical stenosis | 70 (11.2%) |