Fig. 2.

The Chi Squared Automatic Interaction Detection tree illustrating the hierarchy of the factors predicting Active and Inactive participants. The thickness of branches is based on the number of participants in the branch. Categories (for categorical and ordinal variables) and cut-off values (for continuous variables) are shown in italicized text, and the variables in normal text. In interval notations between brackets, inclusiveness and exclusiveness are shown with squared and round brackets, respectively