Comparison between PIMA and FACSCalibur and FACSPresto.

<p>(a) Passing-Bablok regression plot comparison of absolute CD4 count between PIMA and FACSCalibur; (b) Pollock plot indicating %mean bias between PIMA and FACSCalibur</p

Sensitivity, Specificity, Positive (PPV) and Negative Predictive values (NPV) and misclassification rates of absolute CD4 counts at thresholds of 350 cells/μl and 500 cells/μl for FACSPresto and PIMA with FACSCalibur as the reference standard.

<p>Sensitivity, Specificity, Positive (PPV) and Negative Predictive values (NPV) and misclassification rates of absolute CD4 counts at thresholds of 350 cells/μl and 500 cells/μl for FACSPresto and PIMA with FACSCalibur as the reference standard.</p

Comparison between FACSPresto and FACSCalibur.

<p>Passing-Bablok regression plot comparison of (a) absolute CD4 count and (c) CD4% values obtained from FACSPresto with the FACSCalibur as reference standard. The solid line represents the regression line and dashed line the 95%CI. Pollock plots indicating %mean bias between (b) absolute CD4 count and (d) CD4% values obtained on FACSPresto compared with those obtained on the FACSCalibur. The solid line represents the mean bias, the dashed line represents mean bias ±1.96SD.</p