Correlation between relative body water and plasma albumin in cancer patients (study B). Each point indicates a single person at baseline examination. The albumin cutoff level of 679.6 μmol/L (P < .001) has been computed by maximally selected two-sample tests designed to search for possible structural changes and to select an optimal cutoff value as described by Lausen et al.46 The figure indicates also the correlation coefficientr and the corresponding P value for the group of persons with albumin <680 μmol/L.