Each yogurt trial is associated to a values combination (1; 0; þ1) of the 5 factors: A (sucrose concentration in milk), B (rate of
inoculation of L. harbinensis K.V9.3.1Np), C (rate of inoculation of L. rhamnosus K.C8.3.1I), D (duration of fermentation) and E (contamination rate of Y. lipolytica).