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. 2025 Sep 30;13:56. doi: 10.1186/s40352-025-00365-1

Table 3.

Poisson regression results

Variable Name Model 4
Drug Death Rate
Model 5
Opioid Death Rate
IRR
(95% CI)
SE IRR SE
Death Penalty

0.87

(0.58–1.30)

0.18

0.59

(0.30–1.16)

0.20
Civil War Affiliation
 Confederacy (Base)
 Unincorporated

0.79

(0.40–1.54)

0.27

1.14

(0.49–2.64)

0.49
 Union

1.33

(0.88–2.01)

0.28

1.72

(0.88–3.37)

0.59
 Border

0.74

(0.35–1.57)

0.28

1.91

(0.67–5.43)

1.02
Median Household Income

1.00

(0.00–0.00)

0.00

1.00

(1.00–1.00)

0.00
Urbanicity
 Large Central Metro (Base)
 Large Fringe Metro

0.79

(0.40–1.54)

0.27

0.47*

(0.22-1.00)

0.18
 Medium Metro

1.39

(0.85–2.28)

0.35

0.93

(0.44-2.00)

0.36
 Small Metro

2.23**

(1.30–3.81)

0.61

0.75

(0.32–1.75)

0.32
 Micropolitan

4.56***

(2.41–8.63)

1.48

2.04

(0.69–6.02)

1.13
 Non-core

2.44

(0.37–16.29)

2.36

3.27

(0.51–20.84)

3.09
Overcrowded
 Not Overcrowded (Base)
 Overcrowded

1.09

(0.78–1.53)

0.19

0.83

(0.46–1.48)

0.25
Facility Security Level
 Minimum (Base)
 Medium

2.65*

(1.08–6.48)

1.21

3.70

(0.47–29.34)

3.91
 Max

3.13

(0.95–10.35)

1.91

2.58

(0.27–24.67)

2.97
Opioid Dispense Rate

1.00

(0.99–1.01)

0.00

1.00

(1.00-1.01)

0.00
Hospital Distance
 Less than 1 Mile (Base)
 1–2 Miles

0.79

(0.50–1.23)

0.18

0.71

(0.36–1.39)

0.25
 More than 2 Miles

0.77

(0.51–1.17)

0.16

1.06

(0.56–2.01)

0.35
Facility Construction
 Before Crime Bill (Base)
 After Crime Bill

1.09

(0.76–1.56)

0.20

0.87

(0.48–1.59)

0.27
Medicaid Expansion Early
 No (Base)
 Yes

1.21

(0.81–1.80)

0.21

1.18

(0.54–2.61)

0.48
Distance to Bus
 Less than 1 Mile (Base)
 1–2 Miles

1.05

(0.58–1.89)

0.32

0.90

(0.34–2.41)

0.45
 More than 2 Miles

1.66**

(1.16–2.36)

0.30

1.82*

(1.09–3.04)

0.48
Distance to Highway
 Less than 1 Mile (Base)
 1–2 Miles

0.90

(0.59–1.37)

0.19

1.07

(0.50–2.29)

0.41
 More than 2 Miles

0.86

(0.50–1.46)

0.23

1.21

(0.55–2.65)

0.48
Year

1.14***

(1.07–1.21)

0.03

1.18***

(1.08–1.30)

0.06
Constant 0.00 0.00 0.00 0.00

Note. ***P < .001. **P < .01. *P < .05.; IRR = Incidence Rate Ratio; SE = Standard Error; 95% CI = 95% Confidence Interval