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Table 1 Criteria for grading the strength of assay agreement

From: Cytotoxicity evaluation of a Thai herb using tetrazolium (MTT) and sulforhodamine B (SRB) assays

Intra-class correlation coefficient Strength of agreement
< 0.25 Poor
0.25–0.50 Fair
0.50–0.75 Moderate
0.75–0.90 Good
> 0.90 Excellent