Table 2. Multivariable logistic regression model of BTB occurrence excluding smoothed square root of F. hepatica PP value.
Predictor | Coefficient | SE | P | OR | L 95% CI | U 95% CI |
---|---|---|---|---|---|---|
Constant | −30.045 | 3.577 | <0.001 | |||
NN_BTB | 1.020 | 0.213 | <0.001 | 2.77 | 1.83 | 4.21 |
HerdSize | 0.182 | 0.021 | <0.001 | 1.20 | 1.15 | 1.25 |
NDVI | 0.009 | 0.002 | <0.001 | 1.01 | 1.01 | 1.01 |
Sqrt MOff | −0.090 | 0.016 | <0.001 | 0.91 | 0.89 | 0.94 |
MeanT | 1.350 | 0.147 | <0.001 | 3.86 | 2.90 | 5.14 |
VPD | −2.443 | 0.335 | <0.001 | 0.09 | 0.05 | 0.17 |
TVar | 0.158 | 0.034 | <0.001 | 1.17 | 1.10 | 1.25 |
Log-likelihood = −1016.374
Abbreviations and definitions: Fasciola_PP, smoothed square root of F. hepatica percentage positive ELISA value; NN_BTB, nearest neighbour’s smoothed BTB probability; HerdSize, square root of herd size; NDVI, normalised difference vegetation index is a measure of vegetation greenness; SqrtMOff, square root of movements off farm; MeanT, mean temperature (°C); VPD, Vapour Pressure Deficit is a measure of lack of moisture equilibrium between an object and the atmosphere, the higher the VPD, the more rapid the rate of desiccation; TVar, temperature variance, indicates the magnitude of the seasonality, i.e. larger values indicate larger differences between winter and summer extremes; OR, odds ratio; L/U 95% CI, lower and upper 95% confidence intervals of OR.