Table 4 Multivariable multi-level Poisson regression using “parasitic liver” condemnation rates

Year

2001

—

—

—

—

—

2002

1.08

0.04

0.08

0.99

1.17

2003

1.73

0.04

< 0.01

1.60

1.88

2004

1.81

0.04

< 0.01

1.67

1.96

2005

2.06

0.04

< 0.01

1.90

2.24

2006

2.29

0.04

< 0.01

2.12

2.49

2007

1.71

0.04

< 0.01

1.57

1.86

Animal class

Calves

—

—

—

—

—

Cows

1.00

0.06

1.00

0.89

1.13

Heifers

1.45

0.05

< 0.01

1.30

1.60

Steers

1.29

0.08

< 0.01

1.10

1.50

Season

Winter

—

—

—

—

—

Spring

0.88

0.03

< 0.01

0.83

0.94

Summer

1.08

0.03

< 0.01

1.02

1.14

Fall

1.22

0.03

< 0.01

1.15

1.29

Region

Central

—

—

—

—

—

Southern

0.49

0.18

< 0.01

0.35

0.69

Western

0.61

0.18

< 0.01

0.43

0.86

Northern

0.22

0.31

< 0.01

0.12

0.41

Eastern

0.23

0.22

< 0.01

0.15

0.35

Rating

C

—

—

—

—

—

AAA

0.53

0.13

< 0.01

0.41

0.69

AA

0.72

0.09

< 0.01

0.60

0.85

A

0.72

0.09

< 0.01

0.60

0.85

B

0.74

0.09

< 0.01

0.62

0.88

unrated

0.58

0.10

< 0.01

0.48

0.71

Season x animal class

Winter x calves

—

—

—

—

—

Spring x heifers

1.04

0.04

0.37

0.96

1.12

Summer x heifers

0.96

0.04

0.33

0.90

1.04

Fall x heifers

0.90

0.04

0.00

0.84

0.97

Spring x steers

0.96

0.04

0.30

0.90

1.03

Summer x steers

0.89

0.03

< 0.01

0.84

0.95

Fall x steers

0.95

0.03

0.11

0.89

1.01

Spring x cows

1.13

0.04

< 0.01

1.05

1.21

Summer x cows

0.87

0.04

< 0.01

0.81

0.93

Fall x cows

0.75

0.03

< 0.01

0.70

0.80

Region x animal class

Central x calves

—

—

—

—

—

South x heifers

1.90

0.05

< 0.01

1.71

2.10

West x heifers

1.82

0.05

< 0.01

1.65

2.00

North x heifers

2.96

0.17

< 0.01

2.11

4.15

East x heifers

7.34

0.09

< 0.01

6.10

8.82

South x steers

1.55

0.05

< 0.01

1.42

1.69

West x steers

1.76

0.04

< 0.01

1.63

1.91

North x steers

2.90

0.17

< 0.01

2.09

4.01

East x steers

6.09

0.09

< 0.01

5.10

7.28

South x cows

0.96

0.06

0.45

0.85

1.07

West x cows

1.38

0.05

< 0.01

1.26

1.57

North x cows

3.12

0.17

< 0.01

2.24

4.34

East x cows

5.96

0.09

< 0.01

4.96

7.17

Year x animal class

2001 x calves

—

—

—

—

—

2002 x heifers

0.88

0.06

0.02

0.79

0.98

2003 x heifers

0.52

0.06

< 0.01

0.47

0.58

2004 x heifers

0.57

0.05

< 0.01

0.51

0.63

2005 x heifers

0.58

0.05

< 0.01

0.53

0.65

2006 x heifers

0.55

0.05

< 0.01

0.50

0.61

2007 x heifers

0.72

0.05

< 0.01

0.65

0.80

2002 x steers

0.74

0.05

< 0.01

0.67

0.82

2003 x steers

0.65

0.05

< 0.01

0.59

0.72

2004 x steers

0.63

0.05

< 0.01

0.58

0.69

2005 x steers

0.60

0.05

< 0.01

0.55

0.66

2006 x steers

0.50

0.05

< 0.01

0.45

0.54

2007 x steers

0.64

0.05

< 0.01

0.59

0.71

2002 x cows

1.09

0.09

0.32

0.92

1.29

2003 x cows

1.06

0.08

0.46

0.91

1.23

2004 x cows

1.41

0.07

< 0.01

1.23

1.63

2005 x cows

0.91

0.07

0.17

0.79

1.04

2006 x cows

1.01

0.07

0.88

0.88

1.16

2007 x cows

2.12

0.07

< 0.01

1.83

2.44