Fig. 4

network analysis of the three groups (Control on the left, MCI in the middle and mild Alzheimer on the right) keeping the Total Score of Apathy Evaluation Scale. Nodes represent the variables used to calculate the network model; Lines between nodes are the edges: partial correlations between variables (thicker the edge, greater the correlation value); green edges: positive correlations; red edges: negative correlations; black-coloured edges: partial correlations between dichotomous and continuous variables. Predictability value was represented by a ring around each node. The blacker the ring, the more variance of the variable is explained by the other connected nodes