Participant demographics and symptom profiles were compared to those of the wider hospital (requested via clinical information services), routinely collected national child and adolescent mental health service (CAMHS) outcome data from the Child Outcomes Research Consortium (CORC) dataset [46 (link)] and data from a national initiative to improve children’s access to evidence-based psychological therapies (CYP IAPT) [23 (link),36 (link),47 ] by running chi-square tests of homogeneity using R statistical software, version 3.6.3 (R Project for Statistical Computing). Post hoc analyses involving pairwise comparisons using multiple z-tests of two proportions with Bonferroni correction was applied where chi-square tests were statistically significant (p < 0.05). As the amount of clustered data was small, with only six families of those allocated to an intervention containing more than one participant, we accounted for clustering by removing those six families from the analysis. All descriptive statistics were undertaken using SPSS statistical analysis software (version 25, IBM).
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