Table 8.
Distribution of combinations of seroincreases between induction and follow-up in the 7001 animals (cases and controls pooled) with non-missing values for the combined seroincrease variablea,b.
| BoHV-1 | BVDV-1 | BRSV | BPIV-3 | Number of animals | Number of controls | Number of cases | Pooled weightedc % |
|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 1559 | 1033 | 526 | 27.3 |
| 1 | 0 | 0 | 0 | 1522 | 763 | 759 | 21.8 |
| 0 | 1 | 0 | 0 | 432 | 213 | 219 | 6.1 |
| 0 | 0 | 1 | 0 | 498 | 329 | 169 | 8.7 |
| 0 | 0 | 0 | 1 | 225 | 116 | 109 | 3.3 |
| 1 | 1 | 0 | 0 | 505 | 177 | 328 | 5.8 |
| 1 | 0 | 1 | 0 | 623 | 249 | 374 | 7.7 |
| 1 | 0 | 0 | 1 | 310 | 119 | 191 | 3.7 |
| 0 | 1 | 1 | 0 | 180 | 72 | 108 | 2.2 |
| 0 | 1 | 0 | 1 | 109 | 44 | 65 | 1.4 |
| 0 | 0 | 1 | 1 | 106 | 60 | 46 | 1.7 |
| 1 | 1 | 1 | 0 | 330 | 103 | 227 | 3.5 |
| 1 | 1 | 0 | 1 | 127 | 42 | 85 | 1.4 |
| 1 | 0 | 1 | 1 | 210 | 70 | 140 | 2.3 |
| 0 | 1 | 1 | 1 | 87 | 36 | 51 | 1.1 |
| 1 | 1 | 1 | 1 | 178 | 58 | 120 | 1.9 |
a
Seroincrease denoted 0 for ‘no’ and 1 for ‘yes’.
b
BoHV-1: bovine herpesvirus 1; BVDV-1: bovine viral diarrhoea virus 1; BRSV: bovine respiratory syncytial virus; and BPIV-3: bovine parainfluenza virus 3.
c
Pooled weighted averages (0.84 × observed percentage in controls + 0.16 × observed percentage in cases) based on the ratio of the sampling fractions for selection odds of being selected from the NBRDI project population as a case versus as a control (5.3:1).