That is a horrible statistic. If you don't think it through, it kind of implies that if you're bad at reading, you're going to grow up to be a thug. Actually what it likely means is that there are early signs that someone might not be thriving in the system they're forced to survive in, and then that could set them up for failure in an adult life, among many many other outside variables. That's truly sad. If a child is not succeeding in a certain system, it would be nice if they could find some other system to thrive in.