Translations:Advanced Field Epi:Manual 1 - Disease Investigation/341/en
Confounding is situation-specific, and you have to know something about the biology and logic of the situation to guess at things that should be explored as confounders. In general, in most studies you should at least think about the following kinds of variables: species, age, breed, season, sex and physiological status (eg spawning, nursing and growing), level of production.