http://www.latimes.com/science/sciencenow/la-sci-sn-gun-show-deaths-20171023-story.html
http://annals.org/aim/article/2659346/state-interstate-associations-between-gun-shows-firearm-deaths-injuries-quasi
Altogether, they tallied 275 such shows in Nevada and 640 shows in California between Jan. 1, 2005, and Dec. 31, 2013. Then they identified regions in California that were within a one-hour drive of a California gun show or a two-hour drive of a Nevada gun show.
Next, the researchers used state health data to compare the number of gun injuries — both fatal and non-fatal — for each of the study regions in the two weeks before and two weeks after the nearby show. When the show was in California, the “after” period began 10 days after the show’s opening day, because buyers were subject to the state’s 10-day waiting period.
Altogether, 15,000 Californians were injured or killed by firearms in the two weeks before California gun shows, as were 14,893 in the two weeks after those gun shows. In the before-and-after comparison, the rate of firearm injuries and deaths remained essentially flat, at about 1.3 per 100,000 people, the researchers found.
The firearms toll was much lower in regions near Nevada gun shows. Only 44 Californians were injured or killed in the two weeks leading up to those shows, but that figure jumped to 74 in the two weeks afterward. The rate of gun injuries and deaths rose from 0.67 to 1.14 per 100,000 people. After the researchers made some statistical adjustments, that represented a 69% increase in gun-related morbidity and mortality, the study said.