Table 4. Intraobserver Reproducibility and Interobserver Reliability Assessed Using ICCs.
| Measurement | ICC (95% confidence interval) | |
|---|---|---|
| Intraobserver | Interobserver | |
| METD | 0.976 (0.966–0.983) | 0.949 (0.928–0.964) |
| MEAD | 0.954 (0.935–0.967) | 0.944 (0.921–0.960) |
| MSL | 0.970 (0.958–0.979) | 0.921 (0.890–0.944) |
| SPBA to apical odontoid | 0.938 (0.913–0.956) | 0.877 (0.831–0.912) |
| SPBA to posterior odontoid tip | 0.930 (0.903–0.950) | 0.856 (0.801–0.896) |
ICC: intraclass correlation coefficient, METD: minimum external transverse diameter, MEAD: minimum external anteroposterior diameter, MSL: maximum screw length, SPBA: screw projection back angle.