A statistic. Even though the author also said "60 percent less likely than families that DID NOT," she still said a percentage which makes this fact a statistic. You could also make the argument that it was a contrast, but I would go with statistic because that is the best answer.
In my opinion, no. Because that's a form that people can express themselves. Plus, the government probably won't let anything on there that they find offensive to them. So it kinda violates our freedom of speech. (hope this helps!!)