The PDF report covers the difference between print and screen reading around page 27, I think their daily reading must be content available in print and screen but it is not clearly defined.

That section does show that 2/3rds of screen reading though is direct messages, social media, and text in video games. Blogs and forums only hit 1/4.

Kids might be forced to read more than ever before, but not all reading is the same, anymore than using a games console and iPad as a kid makes you fully computer literate.