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The diagnostic value of the arch-peg-area ratio (>0.5) as a test for os odontoideum (see Appendix for definitions of terms)
| Diagnostic value of the arch–peg ratio (%) | >0.5 | >0.63 | >0.65 |
| Sensitivity | 100 | 100 | 94 |
| Specificity | 83 | 100 | 100 |
| Positive predictive value | 55 | 100 | 100 |
| Negative predictive value | 100 | 100 | 99 |
| Test efficiency | 86 | 100 | 99 |
