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Table 5 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 50 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 −0.80 (−1.37, − 0.22)** 0.45
Year 0.06 (0.03, 0.08)*** 1.06
Poverty rate 0.11 (−0.01, 0.22) 1.11
Density −0.03 (− 0.07, 0.01) 0.97
Area 0.99 (0.68, 1.29)*** 2.68
Firearm ownership −0.72 (− 0.86, − 0.59)*** 0.48
Number of laws 0.38 (0.31, 0.45)*** 1.46
Census division
 New England Ref  
 Mid-Atlantic 2.53 (1.96, 3.11)*** 12.59
 East North Central 2.63 (2.09, 3.17)*** 13.92
 West North Central 1.30 (0.65, 1.94)*** 3.65
 South Atlantic 2.67 (2.14, 3.19)*** 14.40
 East South Central 2.21 (1.64, 2.79)*** 9.14
 West South Central 1.00 (0.07, 1.93)* 2.71
 Mountain 0.83 (0.20, 1.47)* 2.30
 Pacific 1.33 (0.66, 2.00)*** 3.79
Zero-inflation model
Variable b (95% CI) Adjusted Odds Ratio
Intercept −2.46 (−3.03, −1.90)*** 0.09
  1. * p < 0.05, ** p < 0.01, *** p < 0.001