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Table 1 Incidence Rate Ratios of Mass Shootings in U.S. Counties

From: Income inequality and mass shootings in the United States

  MSA: Three or More Injuries MSA: Four or More Deaths Mother Jones: Four or More Deaths USA Today: Four or More Deaths
Adj. IRR (95% CI) Adj. IRR (95% CI) Adj. IRR (95% CI) Adj. IRR (95% CI)
Income inequality 1.43 (1.24, 1.66) 1.57 (1.26, 1.96) 1.43 (1.12, 1.82) 1.26 (1.04, 1.52)
Poverty rate 1.35 (0.98, 1.87) 0.97 (0.64, 1.47) 0.83 (0.47, 1.47) 1.23 (0.64, 2.34)
Unemployment rate 1.20 (1.02, 1.41) 1.15 (0.92, 1.44) 1.21 (0.92, 1.60) 1.05 (0.78, 1.41)
Population density 0.27 (0.08, 0.88) 0.22 (0.08, 0.57) 0.18 (0.06, 0.55) 0.39 (0.02, 7.39)
Young population 1.07 (0.84, 1.37) 0.99 (0.70, 1.39) 1.21 (0.89, 1.66) 1.09 (0.86, 1.39)
Minority population 6.27 (1.79, 21.99) 14.36 (5.51, 37.39) 18.01 (7.00, 46.36) 3.53 (0.68, 18.35)
HS graduation rate 0.59 (0.44, 0.78) 0.59 (0.39, 0.90) 0.57 (0.33, 0.97) 0.53 (0.36, 0.78)
2010–2015 2.81 (1.99, 3.98) 1.58 (0.98, 2.55) 1.38 (0.79, 2.42) 1.24 (0.78, 1.95)
Wald Chi-Square 92.96 56.86 50.11 24.99
AIC 1363.44 737.53 545.40 817.02
BIC 1430.88 804.97 612.84 884.46
County-Decades (N) 6273 6273 6273 6273
  1. Adj. IRR adjusted incidence rate ratio, CI confidence interval. All variables are logged and z-score standardized. Robust standard errors clustered by county reported