Table 5 Multivariable Poisson regression models of the association between OTF-W incidence rates and two years culling in Somerset, Gloucestershire and Dorset.

Intervention effect in Somerset area

0.79

0.06

0.004

0.67

0.93

Intervention effect in Gloucestershire area

0.84

0.05

0.005

0.74

0.95

Intervention effect in Dorset area

1.10

0.08

0.168

0.96

1.27

Area = Somerset

1.01

0.09

0.901

0.85

1.20

Area = Dorset

0.69

0.18

0.151

0.41

1.15

Log transformed herds years at risk for 2 years of culling

2.34

0.25

<0.001

1.89

2.90

Log transformed OTF-W incidence rate over 3 years prior

1.59

0.11

<0.001

1.40

1.81

Log transformed median herd size

1.49

0.51

0.249

0.76

2.92

Percentage of land in flood zone 3

0.98

<0.01

<0.001

0.97

0.98

Distance to intervention (km)

1.00

<0.01

0.017

1.00

1.00

Between 0 and 1 badgers removed 1972–2006

Between 2 and 35 badgers removed 1972–2006

0.99

0.10

0.891

0.81

1.20

Between 38 and 72 badgers removed 1972–2006

0.89

0.08

0.172

0.75

1.05

Between 79 and 356 badgers removed 1972–2006

1.41

0.15

0.001

1.15

1.73

Between 371 and 1589 badgers removed 1972–2006

0.91

0.07

0.210

0.77

1.06

Intervention effect in Somerset area

1.09

0.10

0.360

0.91

1.30

Intervention effect in Gloucestershire area

0.89

0.14

0.446

0.66

1.20

Intervention effect Dorset

0.45

0.04

<0.001

0.37

0.54

Area = Somerset

1.09

0.07

0.175

0.96

1.24

Area = Dorset

0.80

0.09

0.035

0.65

0.98

Log transformed herds years at risk for 2 years of culling

2.45

0.27

<0.001

1.97

3.05

Log transformed OTF-W incidence rate over 3 years prior

1.33

0.04

<0.001

1.25

1.42

Log transformed median herd size

1.32

0.14

0.009

1.07

1.62

Percentage of land classed as urban

1.05

0.01

<0.001

1.04

1.07

Length of motorway (km)

1.00

<0.01

0.062

1.00

1.00

Distance to intervention (km)

1.00

<0.01

0.013

0.99

1.00

Percent. of farms with all land inside central/buffer zones

1.01

<0.01

0.001

1.01

1.02