Good points. In terms of lifetime prevalence, that study says that, "Similarly, 3.5 percent of 2- to 5-year-olds had witnessed a shooting during their lifetimes, whereas more than one in five 14- to 17-year-olds (22.2 percent) had witnessed a shooting."

So the population in question is definitely no where near average, my was just that strictly in terms of the amount of violence witnessed, the differences probably aren't as great as one would otherwise assume.