Fig. 4

Partial least squares discriminant analysis (PLS-DA) of the hair metabolome between the eight MCDA twin comparisons, including a measure of prediction model performance (right bar graphs). List of abbreviations; sIUGR = Selective intrauterine growth restriction; T1 = Normal umbilical artery flow; T2&3 = Abnormal umbilical artery flow types; L = Larger twin; S = Smaller twin. The right bar graphics are leave-one-out cross validations (LOOCV), where R2 indicates how well the model explains the data and Q2 indicates reproducibility of the PLS-DA model