Table 2. Test characteristics of Determine HBsAg determined in comparison with a reference test in adult and antiretroviral-naïve HIV-1 positive patients in Ifakara, Tanzania.

TP	FP	TN	FN	Sensitivity	Specificity	NPV	PPV	Inter-rater Agreement
N	n	n	n	% (95% CI)	% (95% CI)	% (95% CI)	% (95% CI)	κ (95% CI)
24	0	247	1	96 (82.8–99.6)	100 (98.9–100)	99.5 (98.1–99.9)	100 (90.1–100)	0.97 (0.93–1)

Abbreviations: CI, confidence interval; FN, false negative; FP, false positive; NPV, negative predictive value; PPV, positive predictive value; TN, true negative; TP, true positive. Agreement is measured between two independent readings of Determine HBsAg.