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Table 2 Logistic regression models for scrapie risk (Adjusted odds ratios (AOR) shown in bold differ significantly (P < 0.05) from one)

From: Flock-level risk factors for scrapie in Great Britain: analysis of a 2002 anonymous postal survey

attribute

never versus ever

never versus homebred

purchased versus homebred

 

AOR

95% CL

AOR

95% CL

AOR

95% CL

  

lower

upper

 

lower

upper

 

lower

upper

region

East Midlands

baseline

-

-

baseline

-

-

-

-

-

eastern England

0.90

0.34

2.37

1.32

0.12

14.42

-

-

-

north-east England

0.63

0.30

1.31

0.55

0.10

2.95

-

-

-

north-west England

1.05

0.55

2.00

1.17

0.26

5.31

-

-

-

central and south Scotland

0.29

0.14

0.60

0.18

0.03

1.07

-

-

-

Scottish Highlands & Islands

0.53

0.25

1.12

0.74

0.16

3.35

-

-

-

south-east England

1.18

0.59

2.37

0.71

0.12

4.15

-

-

-

Shetland Isles

3.42

1.55

7.57

7.54

1.66

34.20

-

-

-

south-west England

0.83

0.46

1.48

1.39

0.36

5.45

-

-

-

central and south Wales

0.34

0.18

0.63

0.79

0.20

3.14

-

-

-

North Wales

0.25

0.11

0.58

0.30

0.05

1.76

-

-

-

West Midlands

0.74

0.39

1.41

1.05

0.23

4.91

-

-

-

Yorkshire and Humberside

1.46

0.79

2.68

1.53

0.34

6.84

-

-

-

farm type

hill

-

-

-

-

-

-

baseline

-

-

upland

-

-

-

-

-

-

0.42

0.18

1.01

lowland

-

-

-

-

-

-

0.35

0.18

0.66

flock type

purebred

baseline

-

-

baseline

-

-

-

-

-

commercial

0.55

0.37

0.81

0.46

0.24

0.86

-

-

-

both

1.35

0.84

2.17

1.70

0.82

3.51

-

-

-

flock size interacting with stocking density

first quartile

1.06

0.84

1.33

0.93

0.67

1.29

-

-

-

second quartile

1.69

0.96

2.98

1.96

0.80

4.81

-

-

-

third quartile

2.13

1.17

3.89

3.75

1.27

11.06

-

-

-

fourth quartile

1.58

0.90

2.75

1.96

0.80

4.77

-

-

-

proportion homebred

-

-

-

1.36

1.22

1.50

1.37

1.24

1.52

lambs bought-in

no

-

-

-

baseline

-

-

-

-

-

yes

-

-

-

2.13

1.16

3.89

-

-

-

lambing practices

individual pens in building

baseline

-

-

baseline

-

-

-

-

-

unconfined at pasture

1.37

0.80

2.35

3.46

0.94

12.78

-

-

-

group pens at pasture

1.89

0.81

4.42

3.70

0.63

21.66

-

-

-

group pens in building

1.90

1.17

3.10

5.09

1.44

17.92

-

-

-

did not lamb

2.33

0.88

6.21

16.63

2.45

113.0

-

-

-

lambing location

always the same place

baseline

-

-

-

-

-

-

-

-

sometimes the same place

0.51

0.29

0.90

-

-

-

-

-

-

never the same place

1.83

0.48

7.00

-

-

-

-

-

-

ewe breeds

Suffolk

-

-

-

2.21

1.32

3.68

-

-

-

Texel cross

-

-

-

-

-

-

0.34

0.14

0.86

Charollais cross

2.98

1.92

4.63

-

-

-

-

-

-

Bluefaced Leicester

-

-

-

0.34

0.13

0.93

-

-

-

Swaledale

-

-

-

8.56

3.40

21.60

-

-

-

ram breeds

Suffolk

1.58

1.20

2.07

-

-

-

-

-

-

Blackface

0.25

0.09

0.75

-

-

-

-

-

-

Charollais

-

-

-

2.55

1.33

4.91

-

-

-

Beulah Speckled Face

-

-

-

0.20

0.04

1.00

-

-

-

Swaledale

2.95

1.58

5.50

-

-

-

-

-

-

Hosmer-Lemeshow goodness-of-fit test

P = 0.41

P = 0.18

P = 0.94

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BMC Veterinary Research

ISSN: 1746-6148

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