Table 4

Repeated measures multi-level model of 10,039 cattle from 102 unvaccinated herds with PP BHV-1 levels as the continuous outcome and seropositive yes/no as the discrete outcome (Dataset B, see methods section).

Continuous

Discrete outcome


Variable

Category level

No. herds

No. cattle

No. obs

Coef

SEb

P value

Coef

SEb

P value


Intercept

-0.05

0.08

2.95

0.42


Triplet codea

Reactive

35

3839

7286

Proactive

31

4900

8660

-0.17

0.09

0.05

-0.43

0.46

0.35

Survey

36

3665

7776

-0.10

0.09

0.28

-0.19

0.48

0.69

Restocked

No

82

10235

19398

Yes

24

2278

4433

0.23

0.07

<0.01

1.10

0.36

<0.01

Farm location

Area A

33

2736

4975

Area B

62

8644

16438

-0.01

0.09

0.91

-0.53

0.47

0.26

Area C

11

1133

2418

-0.01

0.13

0.94

-0.51

0.72

0.48

Age (years)

2

91

1901

1969

3

101

3996

4401

0.08

0.01

<0.01

0.16

0.07

0.02

4

102

3877

4325

0.24

0.01

<0.01

0.72

0.07

<0.01

5

100

3239

3634

0.35

0.01

<0.01

1.11

0.07

<0.01

6

101

2652

2870

0.41

0.01

<0.01

1.36

0.08

<0.01

7

96

2011

2181

0.48

0.01

<0.01

1.51

0.08

<0.01

8

96

1520

1658

0.53

0.02

<0.01

1.59

0.10

<0.01

9

94

1001

1118

0.59

0.03

<0.01

1.67

0.16

<0.01

>10

88

641

1675

0.50

0.08

<0.01

0.52

0.70

0.46

Herd size

3–68

22

644

1246

70–137

22

1488

2944

-0.02

0.09

0.88

-0.05

0.50

0.92

141–199

20

2118

4232

0.05

0.09

0.59

0.88

0.49

0.07

200–274

19

2921

5969

0.25

0.10

<0.01

1.53

0.52

<0.01

284–847

19

5233

9331

0.40

0.10

<0.01

2.21

0.53

<0.01

Herd had

No

53

3049

6362

dairy cattle

Yes

53

9482

17469

0.18

0.06

<0.01

1.02

0.33

<0.01

Herd had

No

79

10092

19019

grower cattle

Yes

27

2439

4812

-0.12

0.07

<0.01

-0.29

0.35

0.41

Cattle birthplace

Homebred

83

5654

11059

Purchased

82

3894

7545

-0.06

0.01

0.07

-0.01

0.06

0.87

Season

Winter

55

4008

6862

Spring

52

4715

8166

-0.07

0.01

<0.01

-0.25

0.06

<0.01

Summer

26

2342

3331

-0.02

0.01

0.05

-0.09

0.08

0.326

Autumn

31

2829

4095

0.10

0.01

<0.01

0.59

0.07

<0.01


aSee Table 1 for variable definition

bStandard Error

The random effects of the repeated measures multi-level model (Variance and SE) Herd: 0.07 and 0.01; Cattle: 0.14 and 0.003; Visit: 0.08 and 0.001.

Woodbine et al. BMC Veterinary Research 2009 5:5   doi:10.1186/1746-6148-5-5

Open Data