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 |