Patient characteristics and surgical demographics.
| Variable | Group A (n = 40) | Group B (n = 50) | P |
| Age, y | 15.2 ± 1 | 14.6 ± 2 | 0.200 |
| Sex, n, M/F | 6/34 | 7/43 | |
| Risser (°) | 3.2 ± 0 | 3.2 ± 0 | 0.965 |
| Ponte | 3.1 ± 0 | 3.2 ± 0 | 0.825 |
| Follow-up, mo | 37.5 ± 6 | 40.0 ± 8 | 0.596 |
| Blood loss, mL | 476 ± 76 | 448 ± 65 | 0.063 |
| Surgical time, min | 284.5 ± 65 | 279.4 ± 49 | 0.647 |
| Fused segment | 6.8 ± 0 | 6.3 ± 0 | 0.001 |
Note: Data presented as mean ± SD unless otherwise specified.