Association between age and test result.

Proportions of community controls (CC) and sputum negative contacts(SS−) (n = 61) with positive, Quantiferon in tube test (QFT-IT), Tuberculin Skin Test (TST), IP-10 test, and IL-2 test result by age are shown. For IP-10 and QFT-IT, indeterminate results are included. For all tests except the QFT-IT there was a significant trend for increasing test positivity rate by age. Numbers above bars indicate the number of positive subjects per age group/n total for each group.