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Table 3 Variables associated with farms in England and Wales being confirmed positive for scrapie

From: Classical sheep scrapie in Great Britain: spatial analysis and identification of environmental and farm-related risk factors

Variable Value OR 95% CL P-value
Flock-size 1 - 19 0.29 0.21 - 0.40 < 0.0001
  20 - 89 0.13 0.09 - 0.19  
  90 - 335 0.35 0.26 - 0.47  
  > 335 reference   
Soil drainage Freely draining reference   0.045
  Impeded drainage 0.89 0.64 - 1.24  
  Naturally wet 1.80 1.02 - 3.17  
Soil texture Sand reference   0.119
  Loam 0.57 0.28 - 1.14  
  Peat 0.92 0.41 - 2.10  
  Clay 1.08 0.30 - 3.86  
Soil fertility High reference   0.173
  Moderate 1.38 0.59 - 3.22  
  Low 1.14 0.53 - 2.47  
  Very low 0.52 0.16 - 1.71  
  Lime-rich 0.68 0.26 - 1.82