Translations:Advanced Field Epi:Manual 1 - Disease Investigation/124/en
2 x 2 tables
A 2x2 table is a simple way to present summary counts of diseased animals where the animals can be classified by disease status (case or non-case) and on some other possible risk factor with two levels (eg vaccination status classified as vaccinated or not-vaccinated). 2x2 tables are very commonly used in epidemiology to assess possible associations between disease occurrence and possible risk factors.