Separate simple LCMM models, with 1 latent class, for the index Δmean.bpm and Δstd.msec.

BDI.TOT indicates the total score in the Beck Depression Inventory, i.e. the questionnaire administered to evaluate depression severity, STAI.Y.1 indicates the state anxiety measured by the State-Trait Anxiety Inventory, TAS.TOT is the total score in the Toronto Alexitimia Scale used to measure alexithymia, i.e., the difficulty in identifying and describing emotions. “Easy” category was chosen as reference in the item difficulty variable derived from Rasch model and “wrong” as reference for the item answer.