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| Study | No. of subjects | Average age (yr) | SS (°) | PT (°) | PI (°)* |
|---|---|---|---|---|---|
| Roussouly et al.8) | 160 | 43.0 | 39.9 | 12.0 | 51.9 |
| Philippot et al.4) | 67 | 70.2 | 42.4 | 16.4 | 62 |
| Endo et al.5) | 50 | 31.5 | 37.2 | 9.9 | 47.2 |
| This study | 16 | 26.5 | 35.3 | 15.7 | 51.0 |
SS: sacral slope, PT: pelvic tilt, PI: pelvic incidence.
*PI = SS + PT.
