Participants will be recruited from schools located in Lisbon's metropolitan area (Portugal).
The selection of participants will be carried out through a two-phase screening, after
parental consent and assent from the children are obtained. In both phases, the children will
complete a questionnaire that assesses symptoms of anxiety and depression. Children whose
score in the screening of anxiety symptoms is in a percentile equal to or greater than 80
will be selected at both assessment times. Families of children selected through the
screening are invited to an individual assessment session. In this session, a brief set of
questions to parents is asked to ensure their child's eligibility, and current difficulties
are explored in more detail. If the necessary criteria are met, the pre-intervention
evaluation processes take place (child and caregivers complete a set of measures).
To access the efficacy of the UP-C/C, this intervention will be compared with a
cognitive-behavioral intervention previously shown to be effective in the treatment of
anxiety disorders, the Coping Cat program in a group format. Thus, once the recruitment and
evaluation of eligibility criteria is finished, the children and their parents will be
randomly allocated to one of two conditions:
experimental group (i.e., children and parents who benefit from the UP-C/C program);
control group (i.e., children who benefit from the Coping Cat, group format).
In both conditions, 15/16 weekly sessions with the children will take place in groups of 5 to
7 participants. Therapist's and children's manuals are available. The groups will be
conducted by clinical psychologists integrated in the research team. All therapists received
training to conduct the intervention and will receive weekly supervision by the project
supervisor. Every session will be observed and evaluated by an external observer through a
checklist.
Regarding the primary and secondary outcomes, transdiagnostic mechanisms and parental
variables, the study includes 5 assessment times - at pre-intervention, 6 weeks after the
start of the intervention, after the intervention ends and at two follow-ups, 3 and 6 months
after the end of the intervention. The variables related to the therapeutic process are
evaluated at each session (active participation, assessment of program conduction,
therapeutic alliance) and in the 1st session (readiness for change). Informed consent, from
the parents and the children, will be sought at each assessment time. Consent protocol
includes a paragraph, that explains how data will be recorded and who has access to it. Only
information relevant to the study is collected.
For the analysis of the effects of the intervention, a multivariate analysis of variance
(MANOVA) (SPSS 26.0) will be used. To assess participants' engagement in the UP-C/C, data
will be collected from all sessions and percentages of attendance and dropout will be
calculated. ANOVA analysis of variance and Chi-Square tests (SPSS 26.0) will be used to
examine differences between the Experimental Group and the Control Group in attendance/active
participation and dropout, respectively. To explore predictors of attendance/active
participation and dropout Multiple Regressions and Logistic Regressions (SPSS 26.0) will be
used, respectively.
Assuming a mean effect size of 0.4 on improvement in depressive symptomatology, an
alpha=0.05, and power=0.8, for a 2-group design with 5 repeated measures, the total sample
size required is 80 (G*Power). Given an expected dropout of 17%, it will be necessary to
recruit a minimum of approximately 94 children. Thus, a sample of 47 children in the
experimental group and 47 in the control group is expected. 7 UP-C/C groups with a maximum
number of 7 children will be conducted. To allow for a satisfactory number of participants,
the therapeutic groups will be carried out in two periods (March 2023 to July 2023 and
October 2024 to February 2024).
Missing data due to participant's dropout will be handled by intention-to-treat principles,
estimated using the last observation carried forward (LOCF) method.