Prevalence of TB infection and incidence of conversions using QFT-GIT.

†6-month prevalence defined as a positive QFT-GIT result, at either baseline and/or follow-up. 270 children had QFT-GIT testing at baseline. 6 month QFT-GIT testing was performed on 196 children; 134 had negative or indeterminate baseline QFT-GIT tests and were included in analysis of conversions. 74 children were lost to follow-up. ††p>0.05 for all pair-wise comparisons. †††p values compare rate of baseline positivity to follow-up. °p>0.05 for all pair-wise comparisons; if only those with baseline negative results are included (i.e. exclude indeterminates), the rates of QFT-GIT conversion for all thresholds was 22/117 (18.8%,).