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).