Variable | Class | N | N with subsequent positive skin-test | % Skin-test positive | p-value (χ2 test) |
---|---|---|---|---|---|
Gamma | Negative | 21713 | 1323 | 6.55 | <0.001 |
 | Positive | 1107 | 138 | 14.26 |  |
Herd | Beef | 8342 | 400 | 5.15 | <0.001 |
 | Dairy | 14478 | 1061 | 7.97 |  |
DVO | North | 6478 | 281 | 4.62 | <0.001 |
 | Southwest | 7113 | 427 | 6.61 |  |
 | Southeast | 9229 | 753 | 8.78 |  |
Sex | Male | 3409 | 75 | 2.21 | <0.001 |
 | Female | 19411 | 1386 | 7.87 |  |