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Table 7 Negative binomial model describing the relationship between a state’s total number of firearm laws and number of other states for which it is the destination of 100 or more crime-related firearms in a given year, adjusting for state-level characteristics, 2010–2017

From: Firearm laws and the network of firearm movement among US states

Negative binomial model
Variable b (95% CI) Incidence Rate Ratio
Intercept −3.07 (−3.73, −2.41)*** 0.05
Year 0.13 (0.09, 0.16)*** 1.13
Poverty rate 0.35 (0.24, 0.47)*** 1.42
Density −0.02 (−0.09, 0.05) 0.98
Area 0.51 (0.39, 0.64)*** 1.67
Firearm ownership −1.23 (−1.50, −0.96)*** 0.29
Number of laws 0.65 (0.52, 0.78)*** 1.92
Census division
 New England ref  
 Mid-Atlantic 3.08 (2.41, 3.67)*** 21.84
 East North Central 3.49 (2.83, 4.15)*** 32.80
 West North Central 2.85 (2.09, 3.62)*** 17.33
 South Atlantic 3.32 (2.66, 3.98)*** 27.71
 East South Central 2.93 (2.19, 3.66)*** 18.72
 West South Central 2.27 (1.53, 3.02)*** 9.72
 Mountain 1.67 (0.90, 2.44)*** 5.31
 Pacific 1.73 (1.04, 2.41)*** 5.62
  1. * p < 0.05, ** p < 0.01, *** p < 0.001