Changes in low-level viremia during maraviroc intensification. Changes in low-level viremia (by SCA) were assessed with linear mixed models for maraviroc-treated (red) and placebo-treated (blue) subjects. Undetectable values were assigned a value equal to the lowest limit of detection for the assay. Estimated mean levels at each time point are plotted with 95% CIs. Mean changes over each indicated interval are also compared both within and between each arm, with P values provided for each comparison.