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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