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Table 6 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 source 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 −1.69 (−2.32, −1.07)*** 0.18
Year 0.12 (0.08, 0.16)*** 1.13
Poverty rate 0.25 (0.14, 0.37)*** 1.29
Density −0.11 (−0.25, 0.03) 0.89
Area 0.09 (−0.01, 0.20) 1.10
Firearm ownership −0.57 (−0.74, −0.40)*** 0.57
Number of laws −0.40 (−0.55, −0.25)*** 0.67
Census division
 New England ref  
 Mid-Atlantic 2.23 (1.47, 2.98)*** 9.26
 East North Central 2.14 (1.48, 2.79)*** 8.47
 West North Central 0.88 (0.16,1.59)* 2.40
 South Atlantic 2.47 (1.84, 3.11)*** 11.87
 East South Central 1.85 (1.17, 2.54)*** 6.37
 West South Central 1.65 (0.95, 2.34)*** 5.18
 Mountain 0.97 (0.28, 1.65)** 2.63
 Pacific 1.99 (1.28, 2.71)*** 7.34
  1. * p < 0.05, ** p < 0.01, *** p < 0.001