Read the link I provided.

That is the source, that is why I provided it.

Kind of amazing that I have to tell you that in a discussion about literacy.

The 'reads for fun' and 'lowest category of reading/writing ability' are seperate statistics, they are not dependent on or derived from each other, they were measured separately... they are just the two the article focused on, out of a larger report, which is linked in the article, which you can read in its entirety if you want to.

I am astounded that, in a discussion about literacy, I provided the source, and you somehow did not read it or investigate it at all, and am now asking me for the source.

Fact-checking and basic research skills are part of intermediate literacy levels, which you apparently do not possess, so I suppose that is why everything seems fine to you.