The Journal of Child and Adolescent Psychology has published a longitudinal study that assesses whether it is depression that predicts physical or verbal aggression and vice versa, as well as the magnitude of this prediction. To test the effect of primacy and the magnitude of intensity resulting from the comorbid effect, a sample of children between 10 and 13 years old was followed up for 3 years. The results obtained suggest that the presence of depressive symptoms determines future verbal aggression, but that future physical and verbal aggression transversally predicted the appearance of depression. Therefore, from this study, there is a need to consider the longitudinal course of depression in order to improve its treatment in young people. The study can be consulted here.