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Evaluation of immunoassay kits for determination of ochratoxin A in cereals3.1.4.5.2.1 Charm Science3.1.4.5.2.1.1 Descriptive comparisonFigure 4 summarizes the difference in relative values. When looking at the results it seems that at the legal limitsamples tend to bias a little high, at high concentrations they bias a little bit low.50%40%30%20%Difference % (X e -X t )/X t10%0%-10%-20%-30%-40%-50%0 10 20 30 40 50 60 70 80 90 100 110 120Reference Value (ng/g)Figure 4: Descriptive comparison of data in relative values obtained via Charm3.1.4.5.2.1.2 Ordinary linear regressionConcordance between the LFD and the reference values was checked by linear regression, results are summarised inFigure 5 and Table 19. ρ c indicates overall good agreement.3-22 Administrative evaluation | CODA-CERVA