Table 3 Crude OTF-W incidence rates and incidence rate ratios (IRR) for central and buffer zones of intervention areas compared to central and buffers zones of comparison areas, for each 12-month period prior to and post the baseline date when culling started in each area.

From: Assessing effects from four years of industry-led badger culling in England on the incidence of bovine tuberculosis in cattle, 2013–2017

12-month reporting period

Intervention central

Comparison central

IRR

95% confidence interval

p value

Intervention buffer

Comparison buffer

IRR

95% confidence interval

p value

Gloucestershire

  Year 3 prior

0.18

0.15

1.19

0.78

1.76

0.386

0.15

0.17

0.84

0.39

1.60

0.617

  Year 2 prior

0.13

0.18

0.76

0.47

1.17

0.206

0.12

0.19

0.65

0.27

1.32

0.231

  Year 1 prior

0.10

0.19

0.54

0.31

0.91

0.012

0.16

0.22

0.70

0.34

1.31

0.263

  Year 1 post

0.13

0.20

0.65

0.39

1.02

0.052

0.15

0.19

0.78

0.38

1.46

0.447

  Year 2 post

0.13

0.17

0.73

0.43

1.18

0.190

0.19

0.21

0.88

0.44

1.59

0.691

  Year 3 post

0.12

0.16

0.72

0.41

1.19

0.185

0.07

0.15

0.44

0.12

1.18

0.088

  Year 4 post

0.06

0.17

0.32

0.14

0.65

0.0002

0.12

0.14

0.83

0.32

1.80

0.666

Somerset

  Year 3 prior

0.22

0.17

1.32

0.85

1.97

0.181

0.12

0.15

0.78

0.34

1.55

0.496

  Year 2 prior

0.26

0.15

1.73

1.13

2.56

0.009

0.19

0.15

1.26

0.66

2.24

0.413

  Year 1 prior

0.24

0.20

1.24

0.80

1.86

0.299

0.19

0.18

1.07

0.55

1.91

0.800

  Year 1 post

0.24

0.19

1.25

0.80

1.89

0.286

0.23

0.20

1.14

0.60

2.00

0.625

  Year 2 post

0.17

0.18

0.92

0.55

1.46

0.742

0.15

0.17

0.91

0.42

1.75

0.797

  Year 3 post

0.18

0.20

0.92

0.56

1.45

0.735

0.16

0.18

0.87

0.36

1.79

0.741

  Year 4 post

0.12

0.18

0.65

0.34

1.15

0.129

0.14

0.18

0.76

0.32

1.57

0.473

Dorset

  Year 3 prior

0.15

0.14

1.03

0.58

1.73

0.876

0.09

0.11

0.81

0.31

1.80

0.634

  Year 2 prior

0.17

0.15

1.10

0.67

1.73

0.652

0.09

0.10

0.90

0.37

1.93

0.820

  Year 1 prior

0.15

0.16

0.90

0.51

1.50

0.701

0.09

0.17

0.55

0.23

1.13

0.087

  Year 1 post

0.18

0.15

1.21

0.72

1.94

0.411

0.07

0.14

0.50

0.18

1.14

0.083

  Year 2 post

0.20

0.14

1.42

0.87

2.24

0.135

0.08

0.12

0.68

0.26

1.49

0.338

  1. Crude rates for all TB incidents (OTF-W and OTF-S) are shown in Table S4 in the Supplement. OTF-W = Officially Tuberculosis Free Withdrawn (Mycobacterium bovis infection confirmed by post-mortem tests), OTF-S = Officially Tuberculosis Free Suspended. Incidence rates are incidents (OTF-W or all TB) per herd years at risk.
Back to article page