Table 4. Complete list of variables available for multivariable logistic regression analysis.
Variable | Definition | Source |
---|---|---|
BTBID | Identification number for each premises | Assigned |
pp-value
sqrtpp Fasciola_pp |
Anti-F. hepatica antibody ELISA percentage positivity value Square-root transformation of pp-value Smoothed extracted value of sqrtpp from map |
Ref 14 Calculated Calculated |
BTBposneg | Whether a farm has tested positive for a bTB test during 2004-07 | VETNET, DEFRA |
NN_BTB | Log-odds of BTB prevalence of nearest neighbouring farm | Calculated |
Total Reactors
Total Confirmed |
The total number of reactor animals found between 2004-07 The total number of animals confirmed as BTB positive on PME or culture 2004-07 |
VETNET, DEFRA |
SqrtHerd | Herd Size, square-root transformed for this model | VETNET, DEFRA |
NUTS2
NUTS1 AHOID PCArea |
The NUTS2 classification of the premises The NUTS1 classification of the premises The Animal Health Office classification of the premises The postcode area of the premises |
VETNET, DEFRA |
NDVI
EVI |
Normalised Difference Vegetation Index Enhanced Vegetation Index |
MODIS |
SqrtMOff
Sqrt(On+1) |
Square-root transformation of cattle movements off the premises Square-root transformation of one plus cattle movements onto the premises |
RADAR, DEFRA |
MaxT
MinT RainyDays RH VP |
The maximum temperature recorded on the farm (°C) The minimum temperature recorded on the farm (°C) The mean number of rainy days (rainfall >1mm) per year Mean relative humidity on the farm Mean vapour pressure on the farm |
MetOffice |
MeanT | The mean temperature on the farm calculated as a mean of maximum and minimum | Calculated |
VPD | Vapour Pressure Deficit | Calculated |
TVar | Temperature variance, calculated from MODIS fourier curves | Calculated |
EngWales | Location of a farm in either England or Wales | Assigned |