highly significantp < 0.001
With respect to between-group comparisons, no statistically significant difference was found between the groups in the pretest median Trait Anger scores ( p = 0.291, ES = 0.447, 95% CI: −0.370, 1.250), whereas a highly significant difference was detected between the groups in the posttest median Trait Anger scores ( p < 0.001, ES = 1.481, 95% CI: 0.560, 2.380).