Table 4.

Performance of the final pooled-data algorithm with a risk score of at least 2 when applied to site-specific data from Mombasa, Kilifi, Lilongwe and Durban.

Predictive ability	Mombasa, Kenya FSW	Kilifi, Kenya MSM	Lilongwe, Malawi STD clinic patients	Durban, South Africa high-risk women
Sensitivity	58.4%	90.0%	92.9%	18.2%
Specificity	84.8%	74.1%	50.5%	95.4%
Positive predictive value	0.9%	1.0%	3.0%	0.9%
Negative predictive value	99.9%	100.0%	99.8%	99.8%
AUC	0.77	0.89	0.83	0.61
AHI testing indicated	15.3%	26.1%	50.2%	4.6%

AHI, acute HIV infection; AUC, area under the curve; STD, sexually transmitted diseases.