Rates of pre- to postoperative improvement in SRS-Schwab modifiers compared between PNR and PR.
| Radiographic Modifier Improvement | PNR | PR | P Value |
| Improved in SRS-Schwab pelvic tilt modifier | 0% | 100% | <0.001 |
| Improved in SRS-Schwab pelvic incidence-lumbar lordosis modifier | 48.3% | 85.7% | 0.003 |
| Improved in SRS-Schwab sagittal vertical axis modifier | 60.7% | 64.3% | 0.783 |
Note: Bolded values indicate statistical significance at P < 0.05.
PNR, pelvic nonresponders; PR, pelvic responders; SRS, Scoliosis Research Society.