MOESM1 of Effect on background checks of newly-enacted comprehensive background check policies in Oregon and Washington: a synthetic control approach

Additional file 1: Figure S1. Trend in the rate (per 100,000 people) of monthly handgun background checks in the United State by CBC status, 1999 – 2018. Figure S2. Trend in the rate (per 100,000 people) of monthly private party handgun background checks in Washington, July 2013 to December 2018.