Skip to main content

Table 3 Zero-inflated 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 −2.86 (−3.41, −2.31)*** 0.06
Year 0.10 (0.07, 0.13)*** 1.11
Poverty rate 0.22 (0.12, 0.33)** 1.25
Density 0.004 (−0.05, 0.05) 1.00
Area 0.34 (0.17, 0.50)*** 1.40
Firearm ownership −1.20 (−1.48, −0.93)*** 0.30
Number of laws 0.55 (0.44, 0.65)*** 1.73
Census division
 New England Ref  
 Mid-Atlantic 2.91 (2.37, 3.45)*** 18.30
 East North Central 3.46 (2.92, 3.99)*** 31.73
 West North Central 2.74 (2.07, 3.42)*** 15.56
 South Atlantic 3.32 (2.80, 3.83)*** 27.56
 East South Central 2.96 (2.33, 3.59)*** 19.23
 West South Central 2.59 (1.95, 3.23)*** 13.38
 Mountain 1.73 (1.13, 2.33)** 5.62
 Pacific 2.28 (1.67, 2.90)*** 9.80
Zero-inflation model
Variable b (95% CI) Adjusted Odds Ratio
Intercept −1.96 (−2.47, −1.45)*** 0.14
  1. * p < 0.05, ** p < 0.01, *** p < 0.001