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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

From: Risk factors for bovine Tuberculosis at the national level in Great Britain

   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