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Table 10 Two level logistic regression models of the risks associated with body lesions in 249 lactating sows from 80 indoor farms in Britain

From: A cross sectional study of the prevalence, risk factors and population attributable fractions for limb and body lesions in lactating sows on commercial farms in England

 

Shoulders

Hips, spine or tail

Intercept coefficient

0.9

 

1.2

 
 

OR

CI

OR

CI

Week of lactation

0.7

0.4, 1.0

1.0

0.7, 1.4

Body condition score

0.5

0.2, 1.3

0.5

0.2, 1.2

Floor/bedding

    

   Solid with bedding

    

   Partly slatted with bedding

0.9

0.1, 6.1

0.5

0.1, 3.2

   Partly slatted no bedding

1.0

0.2, 5.6

1.3

0.3, 5.9

   Fully slatted

1.7

0.2, 12.3

4.7

0.9, 25.0

Initial response to human presence1

    

   Bright alert and responsive

    

   May be dull

3.4

1.3, 8.6*

1.0

0.4, 2.3

   Dull and unresponsive

4.8

1.2, 19.6*

0.7

0.1, 4.0

Space between sow's tail and the crate

    

   <10 cm

    

   10-20 cm

0.5

0.1, 1.7

0.2

0.1, 0.6*

   >20 cm

0.3

0.1, 0.9*

0.2

0.1, 0.7*

Wet slurry in the sow lying area

    

   No

    

   Yes

7.1

1.5, 34.1*

  

Cracked/broken floor in the sow lying area

    

   No

    

   Yes

4.7

1.1, 19.5*

  

Random effects

Var.

SE

Var.

SE

   Variation between farms

0.5

0.6

0.6

0.6

Hosmer-Lemeshow goodness-of-fit

χ2

P value

χ2

P value

 

1.7

0.92

6.4

0.27

  1. 1[12]
  2. *The CI does not include unity therefore the factor is significantly different from the reference category (p < 0.05)