I did my best to work out a rough estimate of the true proportion of 15-34 year olds visiting the ER who had suffered legal intervention injuries, and arrived at a figure of 0.2% (you can follow my working in this thread). So I believe Lepore’s claim to be off by a factor of several hundred.
Why does this one sentence matter? Well, firstly, it misinforms readers, several of whom (based on my Twitter search for the article’s URL) also alighted on this claim, but unlike me took it on trust. Secondly, and perhaps more importantly, it tells us something about the political climate in a publication like the New Yorker, which was once famous for its rigorous fact checking.Not under David Remnick apparently.