Sample Size
The sample size was calculated based on the study conducted by Yıldırım
and Aylaz (2019) to determine the effect of solution-focused group
counselling on the anxiety levels of individuals with nutrition
disorder. According to the results of this study, the post-process STAI
anxiety score was reported as 40.45 ± 9.22 in the intervention group and
46.73 ± 8.83 in the control group. The influence quantity of the study
was determined as d = 0.839.17 The sample size was
calculated using G*Power18 with a large effect size of
0.84, probability of alpha error .05, a power (1-β) of 0.80 to perform
two independent group model. Minimum sample size was 68, totally.
Considering the possible data loss during the study process, it was
decided to conduct the study with a total of 90 parents, 45 parents in
both groups.
Pre-test was applied until 90 parents with high anxiety levels (whose
STAI-S and STAI-T scores were above 40) and volunteering to participate
in the study were reached. The snowball sampling method was used in the
study due to quarantine and isolation measures, and pre-test was applied
to 102 parents in this process. Parents who did not meet the inclusion
criteria were not included in the study (n=12).
Parents who were included in the study (n = 90) were assigned to
intervention (n = 45) and control (n = 45) groups randomly using a
randomization program. Eight parents from the intervention group and
five parents from the control group were not included in the evaluation
process for various reasons (not completing the sessions, not completing
the final test). Thus, a total of 77 parents were included in the study,
37 of whom were in the intervention group (SFBT) and 40 of whom were in
the control group (no intervention) (Fig. 1).