Table 2.
Univariate analyses of wild animal characteristics (P ≤ 0.20) considered for entry into the multivariable model.
| CharacteristicA | Number of case farms (%) | Number of control farms(%) | Univariate p-value |
|---|---|---|---|
| Waterfowl/shorebirds seen on bodies of water within 320 m (350 yards) of farmB | 23 (34.8) | 9 (15.3) | 0.01 |
| Waterfowl/shorebirds seen on closest body of waterB | 30 (45.5) | 14 (23.7) | 0.01 |
| Waterfowl/shorebirds seen in closest fieldB | 20 (30.3) | 7 (11.9) | 0.02 |
| Waterfowl seen within 91.4 m (100 yards) of the barnsC | 33 (51.6) | 16 (27.6) | <0.01 |
| Wild mammals near barnsD | 13 (21.3) | 19 (35.2) | 0.14 |
Percentage of case farms and percentage of control farms by wild animal characteristics. ADuring the 14-day reference period.
B
Any birds present (tens, hundreds, thousands) vs. none/do not know.
C
Birds often or sometimes seen within 91.4 m (100 yards) of the barn vs. never.
D
Yes vs. no.