Table 3.
Retrospective comparison of baseline characteristics, ODI scores, and surgical factors between cases with nerve root injury and truenegative cases
| Variable | Cases with nerve root injury (n=7) | True-negative cases (n=248) | p-value |
|---|---|---|---|
| Age (yr) | 70 (67–71) | 68 (50–74) | 0.655 |
| Male sex | 1 (14.3) | 45 (18.1) | 0.631 |
| Height (cm) | 146.7±7.2 | 150.9±10.0 | 0.266 |
| Body weight (kg) | 52.1±6.7 | 50.9±10.7 | 0.765 |
| Body mass index (kg/m2) | 24.3±3.1 | 22.4±3.7 | 0.188 |
| American Society of Anesthesiologists classification score | 2.1±0.7 | 1.8±0.5 | 0.106 |
| ODI scores | |||
| Preoperatively | 49.2±16.8 | 41.0±21.2 | 0.391 |
| 6 Months postoperatively | 38.8±14.0 | 32.0±19.7 | 0.441 |
| 1 Year postoperatively | 39.4±15.8 | 28.7±20.2 | 0.240 |
| Surgical factors | |||
| Length of surgery (min) | 404±56 | 360±93 | 0.214 |
| Estimated blood loss (mL) | 1,956±862 | 1,380±1,050 | 0.153 |
| No. of levels fused | 8.3±1.1 | 9.7±2.6 | 0.154 |
| 3-Column osteotomies | 2 (28.6) | 94 (37.9) | 0.471 |
| Multi-stage operation | 2 (28.6) | 59 (23.8) | 0.530 |
| Lumbar lateral interbody fusion | 2 (28.6) | 46 (18.5) | 0.391 |
Values are presented as mean (range), number (%), or mean±standard deviation.
ODI, Oswestry Disability Index.