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Cumulative proportions of patients starting antiretroviral therapy over time for CD4 count thresholds of 500, 350 and 200 cells/μl based on measurements from the benchmark CD4 count enumeration technology (flow cytometry) as well as from biased and less precise technologies. δ measures the relative change in the standard deviation of short-term variability of CD4 counts about a subject’s latent CD4 count when using a novel CD4 count enumeration technology versus the flow cytometry.
