Table 3 Farm-level predictors used in statistical analyses of associations with between-farm association frequency
Predictor variable | Data type | Description | % missing (n = 662) |
|---|---|---|---|
Species | Categorical | Production type or poultry species | 54.38 |
Bird count a | Binary (large vs. small) | Total number of birds on site | 41.39 |
House count a | Binary (large vs. small) | Total number of poultry houses on site | 40.03 |
Indoors b | Binary (yes vs. no) | Categorisation of whether the premises houses any of its birds indoors (e.g. barn, cage or pole barn) | 38.97 |
Outdoors b | Binary (yes vs. no) | Categorisation of whether the premises houses any of its birds outside | 38.97 |
Free-range b | Binary (yes vs. no) | Categorisation of whether the premises has registered any free range birds | 38.97 |
Housing other b | Binary (yes vs. no) | Categorisation of whether the premises keeps any of its birds in other housing | 38.97 |
Partial housing b | Binary (yes vs. no) | Categorisation of whether the premises keeps any of its birds in partial housing (e.g. coop, brooder house, shelter pen or grass run) | 38.97 |
Integrated | Binary (yes vs. no) | Whether premises is part of an integrated company or associated with a company | 6.95 |
Region | Categorical (Eastc, Scotland, Wales, Westc vs. Northc) | Regional location of premises within GB based on the county in the premises address | 8.61 |