Estimated predictive values of the two tests in the four sub-populations (Test 1 = <i>T. brucei</i> s.l. specific PCR; test 2 = <i>T. brucei</i> s.l. ITS-PCR).

PPV is the positive predictive value of the test at a given prevalence i.e. how likely the animal is to have the pathogen given that it has a positive test result. NPV is the negative predictive value of the test at a given prevalence i.e. how likely is an animal not to have the pathogen given that it had a negative test result.