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Table 9 Two level binomial logistic regression models of the risks associated with limb lesions in lactating sows from 82 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

  Wounds
n = 267
Calluses
n = 255
Bursitis
n = 276
Cap. hock
n = 268
Intercept coefficient 0.3   2.2   1.1   -4.0  
  OR CI OR CI OR CI OR CI
Week of lactation 0.6 0.4, 0.8* 1.3 1.0, 1.8 1.5 1.2, 1.8* 1.2 0.9, 1.5
Body condition score 0.7 0.4, 1.4 0.6 0.3, 1.2 0.4 0.2, 0.7* 1.8 1.0, 3.4
Floor/bedding         
   Solid with bedding         
   Partly slatted with bedding 1.0 0.2, 4.5 3.9 1.1, 13.4* 1.8 0.7, 4.8 1.4 0.4, 4.9
   Partly slatted no bedding 3.2 0.9, 12.1 4.4 1.4, 13.4* 1.2 0.5, 2.8 3.5 1.2, 10.7*
   Fully slatted 5.7 1.2, 26.6* 8.9 2.0, 38.6* 0.8 0.3, 2.3 3.8 1.04, 14.2*
Initial response to human presence1         
   Bright alert and responsive         
   May be dull      1.2 0.7, 2.1 2.3 1.2, 4.0*
   Dull and unresponsive      2.7 1.1, 7.0* 2.3 0.9, 6.3
Space between sow's back and the crate         
   <5 cm         
   5-10 cm    0.2 0.1, 0.9*     
   >10 cm    0.2 0.1, 0.8*     
Dry slurry in the sow lying area         
   No         
   Yes 0.2 0.05, 0.8*      0.2 0.1, 0.6*
Random effects Var. SE Var. SE Var. SE Var. SE
   Variation between farms 0.9 0.4 0.7 0.4 1.1 1.0 0.4 0.3
Hosmer-Lemeshow goodness-of-fit χ2 P value χ2 P value χ2 P value χ2 P value
  8.1 0.15 1.3 0.93 3.3 0.66 3.8 0.60
  1. 1[12]
  2. *CI does not include unity therefore the factor is significantly different from the reference category (p < 0.05)