Fig. 3. (a) PLS-DA scores plot (LV2, R2X = 0.491; R2Y = 0.609; Q2 = 0.395) obtained for target analysis between healthy (red triangles) and CD children (blue circles). (b) Variable importance in projection (VIP) plots for partial least squares analysis. A VIP value larger than 0.83 indicates the contribution of VOC in separating the groups (above the line).
