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Absolute and relative interobserver variability as a function of tumor uptake. a Absolute variability (SEM) per individual VOI as a function of tumor uptake (SUVmean), Spearman correlation coefficient is 0.47 and p < 0.0001 (n = 103). b Relative variability (CoV) per individual VOI as a function of tumor uptake (SUVmean). Spearman correlation coefficient is −0.16 and p = 0.10 (n = 103). SUVmean is presented as the average value for observers 1, 2 and 3
