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Table 2 Change in handgun background check rate (per 100,000 People) after implementation of CBC policies in Oregon and Washington, January 1999 to December 2018

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

Measure

Oregona

Washington

Observed mean rate of BCs in treated states following implementation

349.9

237.7

Counterfactual mean rate of BCs following implementation

297.1

228.6

Absolute difference in BC rate following implementationb

52.8

9.1

Estimated % difference in BC rate following implementationc

18.0

4.0

N states in the donor pool with change ≥ treated state (n = 28)d

2

9

  1. CBC comprehensive background checks, BCs background checks
  2. a Permutation test for Alaska did not converged, resulting in 27 control states. b Mean difference in background check rate between the treated states and their synthetic control after policy implementation. c Percentage difference in background checks rate in reference to BC rate of the synthetic controls after policy implementation. d Results from permutation test, measured as the post-intervention RMSPE/pre-intervention RMSPE