Table 3 Results of the mixed-effects Poisson regression models comparing incidence rates of outbreaks

1

Categorization of the number of farms by province that had bought the vaccine

1

133.8

(based on modelling of crude incidence rates)

(0-4 farms)

Referent

(140.1)

2

1.4

0.70, 2.7

(5-10 farms)

3

4.0

1.9, 8.6

(>10 farms)

2

Categorization of the number of farms by province that had bought the vaccine

1

(based on modelling of crude incidence rates)

(0-4 farms)

Referent

132.9

2

1.3

0.66, 2.6

(136.1)

(5-10 farms)

3

3.6

1.7 , 7.5

(>10 farms)

Categorization of the number of vets or retailers by province who had bought the vaccine

1

(0-1 vet or retailer)

Referent

2

1.9

0 .91, 4.1

(>1 vet or retailer)

3

Categorization of the number of farms by province that had bought the vaccine

1

116.3

(based on modelling of standardized incidence rates)

(0-4 farms)

Referent

(114.3)

2

1.3

0.56, 2.9

(5-10 farms)

3

2.7

1.1, 6.5

(>10 farms)

4

Categorization of the number of farms by province that had bought the vaccine

1

116.0

(based on modelling of standardized incidence rates)

(0-4 farms)

Referent

(114.0)

2

1.2

0.51, 2.6

(5-10 farms)

3

2.6

1.1, 6.4

(>10 farms)

Categorization of the number of vets or retailers by province who had bought the vaccine

1

(0-1 vet or retailer)

Referent

2

1.8

0.71, 4.7

(>1 vet or retailer)