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. Author manuscript; available in PMC: 2010 Mar 1.
Published in final edited form as: Int J Tuberc Lung Dis. 2009 Sep;13(9):1130–1136.

Figure 2. Receiver Operating Characteristic (ROC) curve for Fluorescence Microscopy (FM).

Figure 2

The sensitivity and specificity of FM at different smear positive thresholds was assessed using ROC analysis. The points on the graph from left to right represent thresholds of 1 through 9 acid-fast bacilli (AFB) per length followed by 1+, 2+ and 3+ FM smear results. Maximum area under the curve (0.82, 95% CI 0.78– 0.85) was obtained at a threshold of > 4 AFB/100 fields and resulted in a sensitivity of 68% and specificity of 90%.