Fig. 7

Classification tree model obtained by binary recursive partitioning to predict EcO157 contamination risk of MAP lettuce based on the effect of biotic and abiotic variables on the change in EcO157 population size (ΔLog(CFU/g) during storage at 6 °C and 24 °C. Branching based on cutoff value of Log worth, 2 and minimum n, 7. Spp rich., species richness (derived from microbiome); Exp. and Conv., experimental and conventional field; Decay, rating on scale 1–10