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Table 5 Regression results, number of visitors in direct contact with animals

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

3.03

1.86

4.21

<0.001

Animal species

    

 cattle

baseline

   

 swine

−0.53

−0.92

−0.13

0.009

 sheep or goat

−1.47

−2.31

−0.63

0.001

 mixed

−0.46

−0.85

−0.07

0.021

Herd size

    

 hobby

baseline

   

 medium

−1.90

−3.13

−0.67

0.002

 large

−1.57

−2.77

−0.37

0.010

Logistic part of model (probability of no visitors)

 

Constant

1.73

1.11

2.35

<0.001

Animal species

    

 cattle

baseline

   

 swine

−0.94

−2.14

0.26

0.123

 sheep or goat

0.59

−0.81

1.98

0.409

 mixed

0.10

−0.65

0.85

0.789

Contact log period

    

 summer

baseline

   

 autumn

−0.88

−1.49

−0.27

0.005

 winter

−0.21

−0.81

0.39

0.489

 spring

0.04

−0.50

0.57

0.891

Herd size

    

 hobby

baseline

   

 medium

−1.83

−2.49

−1.17

<0.001

 large

−4.21

−8.06

−0.35

0.032

  1. Estimates from a negative binomial regression model used to analyse the number of visitors in direct contact with animals in Swedish livestock herds, based on a contact log sent out in 2006–2007.