Table 1.
Intraobserver and interobserver agreement for CVA and CMA measurements
| Intraclass correlation coefficient | 95% confidence interval | |
|---|---|---|
| Intraobserver agreement | ||
| CVA | ||
| 1st vs. 2nd measurement of 1st radiologist | 0.989 | 0.986–0.991 |
| 1st vs. 2nd measurement of 2nd radiologist | 0.992 | 0.990–0.994 |
| CMA | ||
| 1st vs. 2nd measurement of 1st radiologist | 0.983 | 0.978–0.987 |
| 1st vs. 2nd measurement of 2nd radiologist | 0.985 | 0.981–0.989 |
| Interobserver agreement | ||
| CVA | ||
| 1st measurement of 1st vs. 2nd radiologist | 0.989 | 0.986–0.992 |
| 2nd measurement of 1st vs. 2nd radiologist | 0.992 | 0.990–0.994 |
| CMA | ||
| 1st measurement of 1st vs. 2nd radiologist | 0.983 | 0.978–0.987 |
| 2nd measurement of 1st vs. 2nd radiologist | 0.985 | 0.981–0.988 |
CMA, cervicomedullary angle; CVA, craniovertebral angle.
Agreements were found to be over 97% for all measurements (P < 0.001).