Table 3 Characteristics of farms excluded from the farm-level analyses due to missing data
Variable | Farm A | Farm B | Farm C | Farm D | Farm E |
|---|---|---|---|---|---|
Manure spread on fields in summer season | No | ---a | --- | --- | --- |
Manure spread on fields in winter season | No | --- | --- | --- | --- |
Manure stored on farm at any time of year | No | --- | --- | --- | --- |
Other domestic livestock on farm | No | No | No | No | No |
Other commercial poultry on farm | Yes | No | Yes | No | No |
Farm has all-in-all-out policy | --- | Yes | No | Yes | Yes |
Farm water source | Official | Official | Official treated | Non-official treated | Non-official |
Number of houses on farm | 1 | 1 | 2 | 2 | 1 |
Median flock size on farm | 4019 | 1323 | 7971 | 4190 | 6728 |
Number of flocks raised | 4 | 4 | 8 | 14 | 4 |
Number of positive flocks | 3 | 1 | 2 | 5 | 1 |