Fig. 5.

Bland-Altman plots for CEC measured twice 25 days apart. A: Uncorrected measurements for the t0 method. B: Uncorrected measurements for the per-well method. C: Corrected measurements for the t0 method. D: Corrected measurements for the per-well method. In total, 28 samples were measured twice, but eight samples had to be rejected in the t0 method because of high CV of replicates. For better comparability, these samples have also been excluded from the plots for the per-well method. The plots including the rejected samples are shown in supplemental Fig. S8. Dashed lines represent mean ± 2 SDs of differences (95% limits of agreement). The gray solid line represents difference = 0. M1, measurement 1; M2, measurement 2.