Table 3

Gun homicide rates (per 100,000 population) as a function of the prevalence of federal firearms licensees (FFLs) (per 1,000 population) in U.S. counties, by county type and year, 1993–1999

Incident rate ratio

(95% CI)

Incident rate ratio

(95% CI)

All counties

Major cities

Other cities

Suburbs

Small towns

1993–1999

0.98

(0.93, 1.04)

1.70

(1.03, 2.81)

0.73

(0.57, 0.93)

0.87

(0.77, 0.97)

1.00

(0.95, 1.05)

1993

1.09

(1.02, 1.16)

1.69

(0.98, 2.90)

0.86

(0.67, 1.11)

0.99

(0.84, 1.18)

1.11

(1.04, 1.18)

1993

1.03

(0.91, 1.15)

1.65

(0.72, 3.77)

0.62

(0.42, 0.92)

0.78

(0.63, 0.96)

1.07

(0.96, 1.19)

1995

0.84

(0.73, 0.94)

2.16

(0.65, 7.20)

0.30

(0.17, 0.53)

0.65

(0.52, 0.82)

0.87

(0.77, 0.98)

1996

0.95

(0.80, 1.13)

2.58

(0.33, 19.99)

0.64

(0.08, 5.10)

0.71

(0.47, 1.08)

0.99

(0.83, 1.17)

1997

0.96

(0.80, 1.15)

3.12

(0.22, 44.78)

0.28

(0.08,0.96)

0.48

(0.30, 0.76)

1.03

(0.87, 1.13)

1998

0.92

(0.73, 1.15)

11.24

(0.46, 277.38)

0.29

(0.10, 0.87)

0.48

(0.31, 0.72)

0.98

(0.79, 1.22)

1999

0.85

(0.67, 1.07)

12.72

(0.64, 253.19)

0.51

(0.13, 2.00)

0.62

(0.38, 1.01)

0.89

(0.70, 1.12)

Results of generalized linear negative binomial regression models adjusted for covariates.

CI indicates confidence interval.

Wiebe et al. BMC Public Health 2009 9:199   doi:10.1186/1471-2458-9-199