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. Author manuscript; available in PMC: 2017 Oct 18.
Published in final edited form as: J Am Stat Assoc. 2016 Oct 18;111(515):1036–1049. doi: 10.1080/01621459.2016.1152191

Table 2.

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