Objective Many adolescents suffer from depressive and anxiety disorders simultaneously and current treatment methods do not put enough emphasis on comorbidity of these disorders. The unified protocol for treating emotional disorders in adolescents is a transdiagnostic therapy which targets mutual fundamental factors. Therefore, the current study aims to compare the effectiveness of the unified protocol alone with the unified protocol combined with mindfulness as an additional treatment in adolescents suffering from emotional disorders. Method A quasi-experimental study was conducted with adolescents. The participants had been diagnosed with emotional disorders and were divided into a control group (15 participants) and an experimental group (16 participants). Both groups were offered 14 sessions of therapy. They were assessed at pre-test, post-test, and two-month follow-up. Scales used in the study included the Child Behavior Checklist (CBCL), the Children’s Depression Inventory (CDI), and the Youth Anxiety Measure for DSM-5 (YAM-5). Results The results showed that both of the treatment methods effectively reduced adolescents’ emotional problems, but improvements were more significant in the group administered the additional mindfulness program. Among the variables assessed, non-phobic anxiety disorders and depression improved more than specific phobia and behavioral problems. Between-subjects (Group) partial etas for non-phobic anxiety, depression, specific phobia, and behavioral problems were 0.67, 0.50, 0.23, and 0.16, respectively. Conclusion According to the findings of this study, additional treatment methods such as mindfulness could increase the effectiveness of the unified transdiagnostic protocol for adolescents (UP-A). The therapeutic implications are discussed.

Background: Certain scales have been designed to measure fear of happiness as a phenomenon that is observed in different cultures. Objectives: The present study was conducted to investigate the psychometric properties of the fear of happiness scale in an Iranian sample, and to study this phenomenon in the Iranian culture. Methods: A total of 210 students of Kermanshah University of Medical Sciences, Kermanshah, Iran, including 83 males and 127 females, completed the fear of happiness scale (FHS), the mindful attention awareness scale (MAAS), the fear of negative emotions scale (FNES), and the positive and negative affect schedule (PANAS). The data obtained were analyzed in SPSS and LISREL using confirmatory and exploratory factor analyses, the Pearson correlation and Cronbach's alpha. Results: The single-factor structure of the main scale was not confirmed in the sample. Confirmatory factor analysis suggested the fitting of the two factors, and the exploratory factor analysis obtained two factors, namely "fear of experiencing happiness" and "fear of consequences of happiness", which explained 52.41% of the variance. The Cronbach's alpha calculated for fear of experiencing happiness was 0.70 and for fear of consequences of happiness was 0.73. Conclusions: The results of the present research showed that Iranian citizens tend to reduce or suppress their feeling of happiness owing to their cultural beliefs. Moreover, the psychometric properties of the fear of happiness scale were found to be appropriate in Iranian students.