Data analysis
Parameters used to compare the quality of the
tests were the percentage of invalid test results,
eg, missing control band or coloured background;
the percentage of results that were difficult to interpret,
eg, weak control band, spots or dirty result
window; the diagnostic sensitivity (the proportion
of positive test results in infected animals);
the diagnostic specificity (the proportion of negative
test results in uninfected animals); the
positive predictive value (the probability that
a test-positive animal is infected); and the negative
predictive value (the probability that a testnegative
animal is uninfected). In addition, the
positive predictive values when combining two
FIV and FeLV test systems were calculated.