Accuracy and Incremental Yield of the Chest X-Ray in Screening for Tuberculosis in Uganda: A Cross-Sectional Study

Table 3

Incremental yield and number needed to screen of using the CXR in a TB screening algorithm.

Strategy/algorithm	Screened	Tested	NNS	Number of TB cases	% of confirmed TB	Incremental yield (%)
Symptoms only	5142	4512	42	122	76	Ref
X-ray only	5142	4441	35	149	93	17
Symptoms and X-ray	5142	4441	32	160	100	23

NNS: number needed to screen (number of people needed to screen to diagnose a bacteriologically positive case, who has not been previously diagnosed by the health system). TB: tuberculosis.