Table 2

Multivariable mixed logistic regression models for infection with bTB between 2002 and 2008 fitted for the four different models. “-“represents variables that were not significant so not included in that model, “REF” indicates (part of) the reference level., “OR” in the odds ratio and numbers in brackets are the 95% confidence interval
Testing interval
Unit All herds 1 year 2,3 year 4 year
OR p OR p OR P OR p
Country England 1 REF 1 REF - - 1 REF
Wales 0.919 (0.86, 0.98) 0.008 0.889 (0.74, 0.89) <0.001 - - 1.352 (0.99, 1.84) 0.055
Scotland 0.822 (0.64, 1.05) 0.119 - - - - 3.709 (2.59, 5.31) <0.001
X coord x10-5 1.279 (1.22, 1.34) <0.001 1.377 (1.28, 1.49) <0.001 - - - -
Y coord y10-5 1.123 (1.05, 1.21) <0.001 1.179 (1.03, 1.35) 0.016 0.856 (0.83, 0.90) <0.001 1.125 (0.92, 1.37) 0.241
Testing interval 1 1 REF - - - - - -
2 0.445 (0.42, 0.47) <0.001 - - 1 REF - -
3 0.212 (0.16, 0.27) <0.001 - - 0.455 (0.35, 0.59) <0.001 - -
4 0.181 (0.17, 0.19) <0.001 - - - - - -
Herd type Beef 1 REF 1 REF 1 REF 1 REF
Fatt’ 1.221 (1.14, 1.31) <0.001 1.254 (1.15, 1.37) <0.001 1.214 (1.03, 1.43) 0.023 1.942 (1.54, 2.45) <0.001
Suckler 1 REF 1 REF 1 REF 1 REF
Dairy 1 REF 1 REF 1 REF 1 REF
Store 1 REF 1 REF 1 REF 1 REF
Herd size 0 – 10 1 REF 1 REF 1 REF 1 REF
11 – 100 2.059 (1.84, 2.31) <0.001 2.976 (2.56, 3.46) <0.001 3.366 (2.43, 4.66) <0.001 2.306 (1.35, 3.95) 0.002
>100 4.026 (3.59, 4.52) <0.001 5.712 (4.87, 6.71) <0.001 7.616 (5.44, 10.6) <0.001 7.654 (4.57, 12.8) <0.001
Irish imports 0 1 REF - - - - 1 REF
>0 1.760 (1.41, 2.19) <0.001 - - - - 4.005 (2.85, 5.63) <0.001
Badgers Count/10 1.060 (1.04, 1.09) <0.001 1.070 (1.03, 1.11) <0.001 - - - -
History No 1 REF 1 REF 1 REF - -
Yes 1.379 (1.30, 1.46) <0.001 1.369 (1.28, 1.46) <0.001 1.750 (1.41, 2.17) <0.001 - -
High risk moves 0 1 REF 1 REF 1 REF 1 REF
1-10 3.342 (2.95, 3.79) <0.001 1.410 (1.16, 1.71) <0.001 1.230 (0.83, 1.83) 0.306 1.678 (1.24, 2.27) <0.001
>10 7.463 (6.61, 8.43) <0.001 2.020 (1.66, 2.47) <0.001 2.261 (1.52, 3.36) <0.001 8.726 (6.85, 11.1) <0.001
FMD No 1 REF - - 1 REF - -
Yes 1.217 (1.07, 1.38) 0.002 - - 1.469 (1.11, 1.94) 0.007 - -
x*y 0.917 (0.90, 0.94) <0.001 0.903 (0.87, 0.94) <0.001 - - - -
Area under the ROC 0.896 0.767 0.792 0.912

Bessell et al.

Bessell et al. BMC Veterinary Research 2012 8:51   doi:10.1186/1746-6148-8-51

Open Data