Table 5. Resource hypothesis model formulation and coefficient estimates for molecular case series study design.
Model | Parameter | Coefficient estimate | Standard error | Z value | P value |
Salmonella DICE = β1+β2|CS|+β3|DS|+β4 ED+β5|ΔEVI|+β6|HS|+β7|DW|+β8|WB|+β9H+β10Pig+β11|DP| Adjusted r2 = 3% | (Intercept) | 55.55 | 0.25 | 224.19 | 0.001 |
|Condition score| (|CS|) | −2.99 | 0.32 | −9.48 | <0.001 | |
|Dist. to streams| (|DS|) | −0.22 | 0.16 | −1.33 | 0.098 | |
Euclidean distance (ED) | −0.02 | 0.00 | −4.53 | <0.001 | |
|EVI decline| (|ΔEVI|) | 0.00 | 0.00 | −0.46 | 0.303 | |
|Herd Size| (|HS|) | −0.02 | 0.01 | −1.31 | 0.107 | |
|Wallaby density| (|DW|) | −3.20 | 0.40 | −8.07 | <0.001 | |
|water bodies| (|WB|) | 0.07 | 0.06 | 1.29 | 0.088 | |
Same herd (Indicator: 0 = false) (H) | 1.14 | 0.24 | 4.71 | 0.001 | |
Same pig (Indicator: 0 = False) (Pig) | 44.45 | 2.00 | 22.27 | <0.001 | |
|Wild pig density| (|DP|) | 16.41 | 2.67 | 6.15 | <0.001 |
A fixed effect (indicator) covariate for herd and the distance between two pigs were included to control clustering and spatial autocorrelation.