The way I saw it at first was having the text appear in the same style as the rest of it, for example, its going to be in a book, so it would appear out of paper (not the book) just another piece of paper like this...
yer, these...but reversed
Or maybe cater the text to a specific coarse, for example if the book opens on the chemistry page have some sort of chemical reaction which reveals the statistics.
Or...thinking about the tabs on popup books which makes things move and appear etc, have them reveal the statistics
the videos above arn't done by tabs, but it gives the sence of the reveal of statistics.
Video's with the pop up...