Fig. 4.

Spearman’s quantitative correlations between comparing two assays for the detection of anti-fibrillarin antibodies. Aptiva fibrillarin particle-based multi-analyte technology (PMAT) assay versus the fluorescence enzyme immunoassay (FEIA) using 32 patient samples where semi-quantitative results for FEIA were available. A high level of agreement was found between PMAT and FEIA (rho = 0.89). a The correlation with data points coded based on patient groups (diagnosis available or unresolved). b The same data coded by indirect immunofluorescence titer