Statistics techniques applied to epidemiologic studies from abattoir data of bovine tuberculosis SUMMARY Veterinary inspection during slaughter is a data source that has got bias and its correction gives accuracy to epidemiologic studies. With information from two slaughterhouses, named A and B and placed in Buenos Aires province, it has been done trends studies employing linear regression and bovine tuberculosis condemnated carcasses standarized rates during 2000 and 2001. The trends grew up in both abattoirs and standarized rates were 0,41 % in slaughterhouse A and 0,29 % in B. This allowed to state that in abattoir B the rate was higher than in abattoir A eliminating the confounding caused by age attribute, the crucial importance in chronic diseases as tuberculosis. These results improve epidemiologic surveillance and existing data sources are being used