Variable | Categories | IRR1 | Std. Err. | P-value | 95% CI | |
---|---|---|---|---|---|---|
Year | 2001 | — | — | — | — | — |
2002 | 0.83 | 0.02 | < 0.01 | 0.79 | 0.86 | |
2003 | 1.14 | 0.02 | < 0.01 | 1.09 | 1.19 | |
2004 | 0.80 | 0.03 | < 0.01 | 0.76 | 0.84 | |
2005 | 0.75 | 0.03 | < 0.01 | 0.71 | 0.79 | |
2006 | 0.45 | 0.03 | < 0.01 | 0.43 | 0.49 | |
2007 | 0.31 | 0.04 | < 0.01 | 0.28 | 0.34 | |
Animal class | Calves | — | — | — | — | — |
Cows | 0.30 | 0.23 | < 0.01 | 0.19 | 0.47 | |
Heifers | 0.39 | 0.11 | < 0.01 | 0.32 | 0.49 | |
Steers | 0.16 | 0.07 | < 0.01 | 0.14 | 0.19 | |
Season | Winter | — | — | — | — | — |
Spring | 1.07 | 0.02 | < 0.01 | 1.03 | 1.11 | |
Summer | 0.96 | 0.02 | 0.03 | 0.93 | 0.99 | |
Fall | 1.10 | 0.02 | < 0.01 | 1.06 | 1.15 | |
Region | Central | — | — | — | — | — |
Eastern | 1.88 | 0.54 | 0.24 | 0.66 | 5.39 | |
Northern | 0.02 | 1.31 | < 0.01 | 0.001 | 0.20 | |
Southern | 0.75 | 0.47 | 0.54 | 0.30 | 1.90 | |
Western | 0.98 | 0.46 | 0.97 | 0.40 | 2.42 | |
Rating | C | — | — | — | — | — |
AAA | 0.24 | 1.26 | 0.26 | 0.02 | 2.85 | |
AA | 0.18 | 0.64 | 0.01 | 0.05 | 0.62 | |
A | 0.11 | 0.63 | < 0.01 | 0.03 | 0.37 | |
B | 0.15 | 0.63 | < 0.01 | 0.04 | 0.50 | |
unrated | 0.29 | 0.64 | 0.048 | 0.08 | 0.99 | |
# of animals | 1–286 | — | — | — | — | — |
287–498 | 0.70 | 0.12 | < 0.01 | 0.56 | 0.89 | |
499–841 | 0.36 | 0.15 | < 0.01 | 0.27 | 0.48 | |
842–27286 | 0.27 | 0.14 | < 0.01 | 0.20 | 0.35 | |
# of weeks | 1–43 | — | — | — | — | — |
44–49 | 1.72 | 0.07 | < 0.01 | 1.50 | 1.97 | |
50–51 | 2.84 | 0.06 | < 0.01 | 2.55 | 3.16 | |
52 | 2.31 | 0.05 | < 0.01 | 2.11 | 22.54 | |
Season x animal class | Winter x calves | — | — | — | — | — |
Spring x heifers | 0.93 | 0.05 | 0.14 | 0.85 | 1.02 | |
Summer x heifers | 0.92 | 0.05 | 0.10 | 0.83 | 1.02 | |
Fall x heifers | 0.83 | 0.05 | < 0.01 | 0.76 | 0.92 | |
Spring x steers | 0.91 | 0.04 | 0.01 | 0.84 | 0.98 | |
Summer x steers | 0.94 | 0.04 | 0.10 | 0.88 | 1.01 | |
Fall x steers | 0.82 | 0.04 | < 0.01 | 0.77 | 0.88 | |
Spring x cows | 0.78 | 0.09 | 0.01 | 0.66 | 0.93 | |
Summer x cows | 0.73 | 0.09 | < 0.01 | 0.61 | 0.88 | |
Fall x cows | 0.65 | 0.09 | < 0.01 | 0.55 | 0.78 | |
Region x animal class | Central x calves | — | — | — | — | — |
South x heifers | 0.37 | 0.09 | < 0.01 | 0.31 | 0.45 | |
West x heifers | 0.65 | 0.09 | < 0.01 | 0.53 | 0.78 | |
North x heifers | 6.58 | 1.25 | 0.13 | 0.56 | 76.70 | |
East x heifers | 0.72 | 0.16 | 0.05 | 0.54 | 0.99 | |
South x steers | 0.68 | 0.07 | < 0.01 | 0.60 | 0.78 | |
West x steers | 2.81 | 0.06 | < 0.01 | 2.52 | 3.14 | |
North x steers | 67.90 | 1.06 | < 0.01 | 8.44 | 546.45 | |
East x steers | 1.64 | 0.14 | < 0.01 | 1.25 | 2.15 | |
South x cows | 0.26 | 0.27 | < 0.01 | 0.15 | 0.45 | |
West x cows | 1.60 | 0.20 | 0.02 | 1.09 | 2.34 | |
North x cows | 7.39 | 1.49 | 0.18 | 0.40 | 136.25 | |
East x cows | 1.05 | 0.24 | 0.85 | 0.66 | 1.66 | |
Year x animal class | 2001 x calves | — | — | — | — | — |
2002 x heifers | 1.84 | 0.08 | < 0.01 | 1.59 | 2.13 | |
2003 x heifers | 1.53 | 0.08 | < 0.01 | 1.32 | 1.78 | |
2004 x heifers | 1.64 | 0.08 | < 0.01 | 1.41 | 1.92 | |
2005 x heifers | 1.24 | 0.08 | < 0.01 | 1.06 | 1.45 | |
2006 x heifers | 2.23 | 0.08 | < 0.01 | 1.90 | 2.63 | |
2007 x heifers | 2.68 | 0.09 | < 0.01 | 2.25 | 3.20 | |
2002 x steers | 2.05 | 0.05 | < 0.01 | 1.85 | 2.27 | |
2003 x steers | 2.27 | 0.05 | < 0.01 | 2.06 | 2.49 | |
2004 x steers | 2.44 | 0.05 | < 0.01 | 2.20 | 2.69 | |
2005 x steers | 1.64 | 0.05 | < 0.01 | 1.48 | 1.83 | |
2006 x steers | 2.60 | 0.06 | < 0.01 | 2.32 | 2.92 | |
2007 x steers | 2.86 | 0.06 | < 0.01 | 2.54 | 3.23 | |
2002 x cows | 1.07 | 0.19 | 0.74 | 0.73 | 1.55 | |
2003 x cows | 3.09 | 0.14 | < 0.01 | 2.35 | 4.08 | |
2004 x cows | 3.63 | 0.14 | < 0.01 | 2.76 | 4.77 | |
2005 x cows | 1.57 | 0.15 | < 0.01 | 1.17 | 2.12 | |
2006 x cows | 2.57 | 0.16 | < 0.01 | 1.89 | 3.49 | |
2007 x cows | 2.08 | 0.18 | < 0.01 | 1.46 | 2.98 |