NA: not applicable.
Table 4. Pearson correlation coefficients and their P-values
for comparison of results within one assay (intra-assay reproducibility)
and between assays over time (inter-assay reproducibility) as well as
for biological variability over time (two different sampling times) and
differences in incubation times (overnight vs. 2h incubation) of the MSD
multiplex immunoassay.