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Table 4 Regression results, number of professional visitors

From: A survey of visitors on Swedish livestock farms with reference to the spread of animal diseases

Variable Coef. 95% confidence interval P
 category     
Negative binomial part of the model    
Constant 1.87 1.02 2.72 <0.001
Animal species     
 cattle     
 swine −0.48 −0.75 −0.22 <0.001
 sheep or goat −2.15 −2.78 −1.52 <0.001
 mixed −0.33 −0.61 −0.05 0.023
Herd size     
 hobby     
 medium 0.01 −0.86 0.89 0.974
 large 0.59 −0.28 1.47 0.185
Logistic part of model (probability of no visitors)  
Constant 1.08 0.30 1.85 0.007
Animal species     
 cattle     
 swine −2.36 −4.73 0.01 0.051
 sheep or goat −1.33 −5.00 2.33 0.476
 mixed 0.05 −0.54 0.64 0.867
Contact log period     
 summer     
 autumn −0.89 −1.60 −0.18 0.014
 winter −0.39 −0.92 0.14 0.149
 spring −0.52 −1.00 −0.05 0.031
Herd size     
 hobby     
 medium −1.80 −2.88 −0.72 0.001
 large −3.49 −5.14 −1.84 <0.001
  1. Estimates from a negative binomial regression model used to analyse the number of professional visitors in Swedish livestock herds, based on replies to a contact log sent out in 2006–2007.