Table 3.

Diagnostic accuracy of stool Xpert vs the first gastric aspirate or induced sputum sample

	Sensitivity (%; 95% CI)	Specificity (%; 95% CI)	PPV (%; 95% CI)	NPV (%; 95% CI)
a. Diagnostic accuracy of the first GA Xpert compared to the first GA culture
GA Xpert	18/33 (54.5; 36.4-71.9)	226/229 (98.7; 96.2-99.7)	18/21 (85.7; 63.7-97.0)	226/241 (93.4; 89.9-96.5)
b. Diagnostic accuracy of stool Xpert compared to the first GA culture
Stool Xpert	15/33 (45.5; 28.1-63.6)	223/229 (97.4; 98.3-100)	15/21 (71.4; 47.8-88.7)	223/241 (92.5; 88.5-95.5)
c. Diagnostic accuracy of the first IS Xpert compared to the first IS culture
IS Xpert	16/24 (66.7; 44.7-84.4)	240/246 (97.6; 94.8-99.1)	16/22 (72.7; 49.8-89.3)	240/248 (96.8; 93.7-98.6)
d. Diagnostic accuracy of stool Xpert compared to the first IS culture
Stool Xpert	12/24 (50.0; 29.1-70.9)	240/246 (97.6; 94.8-99.1)	12/18 (66.7; 41.0-86.7)	240/252 (95.2; 91.8-97.5)

GA: gastric aspirate; PPV: Positive predictive value; NPV: negative predictive value; IS: induced sputum.