Figure 1From: "Cough officer screening" improves detection of pulmonary tuberculosis in hospital in-patients Flow chart summary of TB detection by cough officer screening (COS) from the time of admission to the time of treatment. Stage I: September 2004 to July 2006; Stage II: August 2006 to August 2008; TP: true positive; FP: false positive; TN: true negative; FN: false negative.Back to article page