Household contacts with tuberculin skin test (TST) conversion from entry to week 8–12 by initial household transmission category and age of contact.

n/N are number of converters divided by the number at risk as defined by the various criteria below. 1TST conversion Criterion 1 (Brazilian guidelines): 1st TST<10 mm; 2nd TST≥10 mm; difference ≥10 mm. Does not include contacts with 1st TST≥10 mm (407, 56%), and those with missing 1st (21, 3%) or 2nd TST (31, 4%) because they are not considered “at risk” by this criterion. 2TST conversion Criterion 2: 1st TST<5 mm; 2nd TST≥10 mm; difference ≥6 mm. Does not include contacts with 1st TST≥5 mm (458, 65%), and those with missing 1st TST (21, 3%) or 2nd TST (31, 4%) because they are not considered “at risk” by this criterion. *Score test from generalized estimating equation (GEE) estimation approach to logistic regression. Only contacts “at risk” of TST conversion are included for each criterion.