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In the example in the Table, the highest relative risk is 2.3, indicating that younger heifers (14 months) were at 2.3 times the risk of having a stillborn calf compared to older (17 months) heifers. However, this has to be interpreted with caution, as the attack rate for older heifers was 15.5%, suggesting that other factors may also have been involved in causing this problem. Examination of the other relative risks list shows them all to be less than 2, suggesting that these factors are not very important. Therefore, from the data provided we can determine that younger heifers are at increased risk of stillbirth, but that there are probably additional factor(s), for which we don't have data, that are contributing to this problem.}}