Geometric Means, Variances and Intraclass-Correlation Coefficients (ICCs) of Serum Concentrations of Amino Acids, Lysoglycerophospholipids, Sphingolipids and Hexose Measured 4 Months Apart Among 100 Healthy Subjects from the EPIC-Potsdam Cohort.

aAbbreviations are as follows: Cx:y (x = number of carbons in the fatty acid side chain, y  =  number of double bonds in the fatty acid side chain), hydroxyl (OH), phosphatidylcholine (PC), acyl (a), sphingomyelin (SM). For detailed nomenclature see Table S1.
bn = 100; except: lysoPC a C6:0 n = 61; SM C20:2 and SM C22:3 n = 99.
cA paired t-test based on log-transformed values was calculated to compare geometric means of metabolite concentrations over-time.
dBased on log transformed values.
eICC calculated as the ratio of between-person variance and total variance.
fFor negative values ICC was calculated based on positive variance estimators [33].
gMetabolite concentration was below the assay's limit of detection.