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InterVA Conditional Probability Letter-Value Correspondences from Byass et al. (2012b).
| Label | Value | Interpretation |
|---|---|---|
| I | 1.0 | Always |
| A+ | 0.8 | Almost always |
| A | 0.5 | Common |
| A− | 0.2 | |
| B+ | 0.1 | Often |
| B | 0.05 | |
| B− | 0.02 | |
| C+ | 0.01 | Unusual |
| C | 0.005 | |
| C− | 0.002 | |
| D+ | 0.001 | vRare |
| D | 0.0005 | |
| D− | 0.0001 | |
| E | 0.00001 | Hardly ever |
| N | 0.0 | Never |
