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Table 7 Generalised linear models (GLM) relating the proportion of animals with evidence of fluke infection at post-mortem within-herds for the years 2011, 2012 and 2013 respectively. The GLM was fitted with a logit link function to ensure predictions from the model would be constrained between 0 and 1 (i.e. 0 to 100 % infected within herd)

From: Liver fluke (Fasciola hepatica) infection in cattle in Northern Ireland: a large-scale epidemiological investigation utilising surveillance data

GLM   2011 N = 4,680 2012 N = 4,794 2013 N = 4,874
Predictor   OR Sig. OR Sig. OR Sig.
Abattoir 0 1   1   1  
  1 1.953 *** 2.158 *** 2.014 ***
  2 1.652 *** 1.798 *** 1.307 ***
  3 1.817 *** 1.777 *** 1.911 ***
  4 0.613 *** 0.636 *** 0.586 ***
  5 0.791 ** 0.979   0.758 **
  6 1.110   1.086   0.926  
  7 1.442 *** 2.005 *** 1.936 ***
Herd size herdsize      0.971^ ***
Min. temp. mintemp      0.885 ***
SD min. temp. SD mintemp    0.777 *   
SD humidity SD humidity 1.074 ** 1.088 **   
Humidity humidity    0.931 *   
Herd type Beef breeding 1   1   1  
  Beef fattening 0.919 * 0.938   0.917 *
  Beef rearing 0.978   0.921   0.960  
  Dairy 1.098 ** 1.188 *** 1.059  
  Other 1.011   1.028   0.940  
Region Armagh 1   1   1  
  Ballymena 1.229 *** 1.585 *** 1.374 ***
  Coleraine 1.139 ** 1.379 *** 1.359 ***
  Derry 1.025   1.273 * 1.148  
  Dungannon 1.093   1.195 *** 1.032  
  Enniskillen 1.318 *** 1.438 *** 1.156 *
  Larne 1.001   1.390 *** 1.373 ***
  Newry 1.034   1.086   0.982  
  Newtownards 1.074   1.120 * 1.296 ***
  Omagh 1.041   1.317 *** 1.064  
  1. ^ = per 100 animals; Significance (Sig.): * P < 0.05; ** P < 0.01; *** P < 0.001