Fig. 2From: Relationship between amniotic fluid metabolic profile with fetal gender, maternal age, and gestational weekMultivariate analysis of the influence of maternal age on the AF metabolic profile. A Two dimensional unsupervised PCA analysis; B Supervised PLS-DA, the Q2 value of the first three components was-0.22. A negative Q2 value indicated an over-fitting of the modelBack to article page