Table 3 Multivariable random intercept negative binomial models

Year

   2001

referent

referent

   2002

1.10

0.76

0.69-1.98

1.53

0.02

1.06-2.20

   2003

0.96

0.90

0.50-1.83

1.34

0.15

0.90-1.98

   2004

0.28

0.004

0.12-0.66

1.06

0.78

0.70-1.60

   2005

0.23

0.001

0.09-0.56

0.96

0.83

0.63-1.45

   2006

0.11

< 0.001

0.03-0.39

1.28

0.23

0.86-1.92

   2007

0.08

0.001

0.02-0.33

0.99

0.98

0.65-1.53

Agricultural region

   Central

referent

referent

   Eastern

1.16

0.67

0.59-2.32

0.88

0.67

0.48-1.61

   Northern

0.15

0.08

0.02-1.22

0.67

0.51

0.20-2.20

   Southern

0.54

0.04

0.30-0.96

0.06

< 0.001

0.03-0.12

   Western

0.97

0.92

0.53-1.77

0.08

< 0.001

0.04-0.16

Season

   Winter

referent

referent

   Spring

N/A

1.08

0.56

0.84-1.39

   Summer

N/A

0.98

0.90

0.76-1.28

   Fall

N/A

0.93

0.54

0.72-1.19

# Pigs processed/year*

0.50

< 0.001

0.46-0.54

0.99995

< 0.001

0.99995-0.99996

Pneumonia

Nephritis

IRR

P-value

95% CI

IRR

P-value

95% CI

Year × Agricultural Region

2002 × Eastern Ont.

0.32

0.02

0.12-0.82

0.72

0.31

0.38-1.35

2002 × Northern Ont.

0.15

0.08

0.02-1.22

1.23

0.73

0.37-4.14

2002 × Southern Ont.

0.48

0.05

0.23-1.00

1.94

0.08

0.93-4.02

2002 × Western Ont.

0.77

0.49

0.36-1.62

1.02

0.96

0.53-1.96

2003 × Eastern Ont.

0.34

0.04

0.12-0.94

0.43

0.03

0.21-0.91

2003 × Northern Ont.

3.45

0.30

0.33-36.38

1.81

0.34

0.54-6.04

2003 × Southern Ont.

0.28

0.004

0.12-0.67

2.38

0.03

1.12-5.08

2003 × Western Ont.

0.65

0.30

0.29-1.46

1.26

0.50

0.64-2.47

2004 × Eastern Ont.

0.56

0.41

0.14-2.22

0.93

0.85

0.45-1.94

2004 × Northern Ont.*

0.0002

1.00

0.0-0.0009

2.54

0.14

0.75-8.60

2004 × Southern Ont.

0.98

0.97

0.34-2.83

3.23

0.01

1.50-6.95

2004 × Western Ont.

2.48

0.08

0.91-6.77

0.85

0.67

0.39-1.84

2005 × Eastern Ont.

1.11

0.88

0.30-4.03

1.88

0.07

0.95-3.72

2005 × Northern Ont.*

0.0002

1.00

0.0-0.001

0.91

0.90

0.19-4.23

2005 × Southern Ont.

0.59

0.41

0.17-2.06

4.07

< 0.001

1.85-8.93

2005 × Western Ont.

1.61

0.40

0.53-4.89

0.82

0.64

0.36-1.88

2006 × Eastern Ont.

2.06

0.37

0.43-9.90

1.86

0.11

0.86-4.01

2006 × Northern Ont.*

0.0003

1.00

0.0-0.0014

1.19

0.82

0.28-5.02

2006 × Southern Ont.

3.17

0.10

0.81-12.35

2.90

0.01

1.32-6.34

2006 × Western Ont.

3.95

0.05

1.02-15.35

0.81

0.61

0.37-1.79

2007 × Eastern Ont.*

0.0001

1.00

0.0-0.0005

1.80

0.10

0.89-3.66

2007 × Northern Ont.*

0.0004

1.00

0.0-0.0018

2.51

0.21

0.60-10.59

2007 × Southern Ont.

4.54

0.08

0.93-22.21

5.70

< 0.001

2.64-12.32

2007 × Western Ont.

4.64

0.06

0.95-22.68

1.86

0.11

0.86-4.01

Kidneys nephritis model

Season × census agricultural region

Winter × Central Ont.

Spring × Eastern Ont.

Summer × Eastern Ont.

Fall × Eastern Ont.

Spring × Northern Ont.

Summer × Northern Ont.

Fall × Northern Ont.

Spring × Southern Ont.

Summer × Southern Ont.

Fall × Southern Ont.

Spring × Western Ont.

Summer × Western Ont.

Fall × Western Ont.