Table 1. Case-control study.
Age distribution of ECF deaths (cases) and age-matched, T. parva–exposed but surviving calves (controls). The conditional logistic regression analysis (see Materials and Methods) controls for any imbalance across age classes. The number of deaths by age class predicted by the mathematical model (see Material and Methods) is compared.
|
Age class |
Age (days) |
Observed no. of deaths |
Predicted no. of deaths |
No. of survivors |
| 1 | 15–59 | 7 | 10.5 | 28 |
| 2 | 60–104 | 8 | 5.4 | 17 |
| 3 | 105–159 | 5 | 3.1 | 17 |
| 4 | 160+ | 4 | 5.1 | 19 |
| All | 24 | 81 |