Table 4 |
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|
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). |
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|
Continuous |
Discrete outcome |
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|
|
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|
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. |
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|
Woodbine et al. BMC Veterinary Research 2009 5:5 doi:10.1186/1746-6148-5-5 |
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