Multivariate logistic regression analysis of factors that affect algorithm specificity in all 714 patients. The meaning of the colors is explained at the bottom of the figure. Numbers indicate the chi-square p-value of the respective variable analyzed. Odds ratios of variables of particular interest and their 95% confidence intervals are shown in the text. HIV-1 RNA was used as a dichotomized parameter (<50 or ≥50 copies/mL).