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
115–59710.528
260–10485.417
3105–15953.117
4160+45.119
All2481