Number and percentage (95% CI) of indeterminate results, number of positive and interpretable results and sensitivity rates (percentage; 95% CI) of QuantiFERON® Gold in Tube (QFT-GIT) in groups of individuals without active TB at varying risks of <i>M. tuberculosis</i> exposure.

Footnotes: QFT-GIT: QuantiFERON® Gold in Tube; HIV: human immunodeficiency virus; TB: tuberculosis. (a)QFT-GIT with specific antigen cut –off point: 0.35 IU/mL. (b)QFT-GIT with PHA cut –off point: 0.50 IU/mL. (c)Clinical sensitivity: overall sensitivity calculated on the total of patients tested (indeterminate results included as negative). (d)Laboratory sensitivity: sensitivity calculated only on the interpretable results (indeterminate results excluded).