I was looking for statistics connecting the results of the JCV index test to the PML risk and I got very confused. It seems that there are two different scales for the index: one that makes <0.2 negative and >0.4 positive, and possibly a second that makes <0.5 good and >1.5 bad.
Does anyone know what's up with those scales? How do they relate to each another and do they measure the same thing? For example, when someone says that his index is 3.71, does he mean 0.371 (borderline), or is he using the second measurement (which makes him a high positive)?
Does anyone know what's up with those scales? How do they relate to each another and do they measure the same thing? For example, when someone says that his index is 3.71, does he mean 0.371 (borderline), or is he using the second measurement (which makes him a high positive)?
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