Differences between derivation cohort and validation cohort.

green: selected variables, red: deselected variables; for variable selection the derivation set was used. After application of the Bonferroni-Holm procedure, haemoglobin and magnesium was found to significantly differ between the sets. CRP = C-reactive protein, ALP = alkaline phosphatase, CK = creatinine kinases, GGT = gamma-glutamyl transpeptidase, MG = magnesium, RBC = red blood count; Differences between derivation cohort and validation cohort.