Fig. 4From: HIV infection in Xi’an, China: epidemic characterization, risk factors to false positives and potential utility of the sample-to-cutoff index to identify true positives using Architect HIV Ag/Ab comboThe incidence of TP and FP at age-specific distributions for repeatedly reactive subjects (a), and (b) the adjusted odds ratio and 95% confidence intervals of risk factors for FP by multivariate analysisBack to article page