Reading comprehension is a common item in dyslexia screening questionnaires, not surprisingly. However, once again the overlap is significant, and therefore the predictive quality is limited. Or perhaps a more realistic (correct?) way to put it is that non-dyslexic individuals also have problems of this type.
If we look at the graph above, we can see that of all those who reported having trouble “most of the time”, something like 15% said they were not dyslexic.
Not as good as some as a predictor. Probably its best use is in the discussion of support, which is highly context dependent. This is because the first question must be “What sort of reading are you referring to?”