Multivariate analysis was used to determine associations between monocyte IFNα/βR expression and clinical markers of disease progression. Analysis was restricted to the subset of HIV-infected subjects for whom CD4⁺ T-cell count, plasma HIV RNA level, and CD38 expression by memory CD8⁺ T cells were all measured (n = 22). Data are shown as the partial correlation coefficients of IFNα/βR expression with each of the correlated variables shown in columns after controlling for each of the variables shown in rows. The association of IFNα/βR expression with CD38 expression by memory CD8⁺ T cells changes minimally after controlling for CD4⁺ T-cell count, HIV-1 RNA level, or both.