Table 1.
Baseline Characteristics of Patients
| Characteristic | No. | Overall (n = 55) |
|---|---|---|
| Sex: male | 55 | 42 (76.4%) |
| Age, y | 55 | 58.9 (45.1–68.3) |
| Race: White | 55 | 54 (98.2%) |
| Body mass index, kg/m² | 55 | 27.7 (24.4–32.8) |
| Diabetes mellitus | 55 | 4 (7.3%) |
| Heart disease | 55 | 5 (9.1%) |
| Active nicotine use | 55 | 2 (3.6%) |
| Serum leukocyte count, 109/L | 49 | 6.8 (5.9–8.5) |
| Indication for surgery upon isolation of C. acnesa | 55 | |
| Wound dehiscence and infection | 19 (34.5%) | |
| Myelopathy/radiculopathy/stenosis | 18 (32.7%) | |
| Pseudoarthrosis | 16 (29.1%) | |
| Hardware failure | 12 (21.8%) | |
| Adjacent segment disease | 4 (7.3%) | |
| Recurrence of index disease | 3 (5.5%) | |
| Fracture | 2 (3.6%) | |
| Cancer | 2 (3.6%) | |
| Others | 3 (5.5%) | |
| Regiona | 55 | |
| Cervical | 24 (43.6%) | |
| Thoracic | 25 (45.5%) | |
| Lumbar | 27 (49.1%) | |
| Sacral | 12 (21.8%) | |
| No. of vertebral levels involved | 54 | 3 (2–7) |
| Revision of instrumentation | 55 | 48 (87.3%) |
| No. of past instrumentations | 55 | 1 (0–2) |
| History of steroid injections | 47 | 26 (55.3%) |
Values represent frequency (%) for categorical variables and median (quartile 1, quartile 3) for continuous variables. No. is the number of nonmissing values.
a
The cumulative sum exceeds the total number of cases, as cases may have affected 2 or more indications and regions.