Table 3.
Intra- and inter- observer reliability
| Parameter | Intra-observer ICC (95% CI) | Inter-observer ICC (95% CI) |
|---|---|---|
| Boxall’s slip angle | High grade: 0.96 (0.93–0.97) | High grade: 0.94 (0.92–0.96) |
| Low grade: 0.95 (0.92–0.96) | Low grade: 0.93 (0.90–0.95) | |
| Normal: 0.89 (0.84–0.93) | Normal: 0.87 (0.81–0.90) | |
| Dubousset’s LSA | High grade: 0.97 (0.95–0.98) | High grade: 0.95 (0.92–0.96) |
| Low grade: 0.97 (0.96–0.98) | Low grade: 0.98 (0.97–0.98) | |
| Normal: 0.91 (0.87–0.94) | Normal: 0.91 (0.87–0.94) | |
| SDSG LSA | High grade: 0.96 (0.93–0.97) | High grade: 0.93 (0.90–0.95) |
| Low grade: 0.87 (0.81–0.92) | Low grade: 0.84 (0.77–0.88) | |
| Normal: 0.89 (0.80–0.93) | Normal: 0.84 (0.78–0.89) | |
| SDSG-dys LSA | High grade: 0.94 (0.91–0.96) | High grade: 0.88 (0.83–0.91) |
| Low grade: 0.92 (0.88–0.95) | Low grade: 0.89 (0.85–0.92) | |
| Normal: 0.90 (0.85–0.93) | Normal 0.87 (0.82–0.91) | |
| Sagittal rotation | High grade: 0.96 (0.94–0.97) | High grade: 0.93 (0.90–0.95) |
| Low grade: 0.90 (0.85–0.93) | Low grade: 0.87 (0.82–0.91) | |
| Normal: 0.81 (0.74–0.88) | Normal: 0.74 (0.65–0.82) | |
| Kyphotic Cobb | High grade: 0.94 (0.91–0.96) | High grade: 0.91 (0.87–0.93) |
| Low grade: 0.94 (0.94–0.96) | Low grade: 0.90 (0.86–0.93) | |
| Normal: 0.84 (0.76–0.89) | Normal: 0.84 (0.78–0.89) |