ABSTRACT
Digital single-session interventions (SSIs) may be an accessible treatment option for children and young people with symptoms of depression and anxiety during COVID-19. The growth mindset SSI is an evidence-based digital SSI designed to enhance beliefs about the malleability of one's traits and problems. A mixed methods case series design was used to assess the feasibility and acceptability of a growth mindset SSI in patients on waiting lists for treatment with the Psychological Medicine team at Great Ormond Street Hospital. It was delivered as an online CAMHS appointment, as part of the treatment offered by the team. Recruitment, treatment completion, and retention rates were collected, and semi-structured interviews were conducted at post-treatment. Preliminary data on the intervention's impact on symptoms of depression and anxiety, perceived control, and personality mindset were collected. Quantitative measures were collected at baseline, posttreatment, and 1-month follow-up. Recruitment and treatment completion rates were high, but retention was moderate. Data from quantitative measures (n = 25) showed that patients experienced significantly improved personality mindset (Cohen's d = 0.56) from baseline to post-treatment but not at 1-month follow-up. Changes in symptoms of depression and anxiety and perceived control were non-significant at post-treatment and 1-month follow-up. From the interview data (n = 17), three clusters of themes were identified: overall accessibility and interest, specific components of intervention, and potential impact of intervention. Many patients found learning about neuroplasticity and hearing stories from other young people interesting and instilled a hope for change. Findings suggest the growth mindset SSI is feasible and acceptable for children and young people with chronic illness. The appointment's online format was welcomed by patients and families during the pandemic. The little-to-notherapist input suggests the potential widespread use for services in the hospital. Future research and clinical implications are highlighted for implementation and outcomes.