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Table 3 Multivariable analysis of the exposure variables relative to the animal seropositivity outcome

From: Serological evidence of bluetongue virus infection and serotype distribution in dairy cattle in South Korea

Variable

OR

95% CI

p value

Land use

 Agricultural

1.446

0.751 - 2.784

0.270

 Woodland and semi-natural

1.034

0.542 - 1.973

0.920

 Urban

-

-

-

Herd size

 ≤5

2.951

1.411 - 6.171

0.004

 6-30

4.512

2.218 - 9.180

<0.001

 ≥31

-

-

-

Cattle density

 ≤10

1.478

0.745 - 2.935

0.264

 11-20

1.711

0.883 - 3.314

0.111

 ≥21

-

-

-

Adult/calf ratios

 ≤1.0

0.578

0.291 - 1.150

0.118

 1.1-2.0

1.550

0.841 - 2.857

0.160

 ≥2.1

-

-

-

Age class

 Juvenile

0.249

0.128 - 0.484

<0.001

 Subadult

0.449

0.244 - 0.828

0.010

 Adult

-

-

-

Reproductive problems

 Yes

1.081

0.641 - 1.822

0.771

 No

-

-

-

Southern vs northern

 Southern

3.525

2.000 - 6.214

<0.001

 Northern

-

-

-

Eastern vs western

 Eastern

0.332

0.171 - 0.647

0.001

 Western

-

-

-