iCARE 2.0: A Pilot Intervention of Dialectical Behavioural Therapy for Youth With Type 2 Diabetes.

The investigators will conduct a quasi-experimental trial with a small sample of adolescents and one family member to participate in group-based Dialectical Behavioural Therapy (DBT) or be randomized to a control arm. Pre-measures, post-measures, and 3-month follow up measures will be collected on DBT participants and control participants. Participants receiving DBT and parents/guardian of the DBT participants will also be asked to complete 1-on-1 qualitative interviews after the 16-week program is finished. Pilot 1 will consist of group-based DBT and Pilot 2 will consist of group-based DBT with an optional component which incorporates traditional Indigenous medicines and knowledge. Pilot 2 will be built with Indigenous scholars and elders and will be submitted as an amendment to the University of Manitoba Research Ethics Board when appropriate consultation has been completed. We are only requesting approval for Pilot 1 at this time.

Screening, Enrolment and Intervention Assignment: Research assistants will recruit participants from the Diabetes Education Resource for Children and Adolescents, located in the Community Services Building at the Health Science Center in Winnipeg, Manitoba. Participants currently enrolled in the iCARE Cohort, who have consented to be contacted about future studies and who meet eligibility requirements will also be approached to share information about this study. Interested participants will be screened utilizing a number of questionnaires and self-report measures in person (if allowable), via telephone, or on REDCap

Pilot 1 will be completed virtually through Zoom HealthCare.

The main outcome measures for the pilot trials were selected to inform the feasibility and sample size required for a larger RCT on a national scale. These include recruitment rates, retention rates, adherence to the intervention, retention for follow-up measurements, and satisfaction with the intervention. The investigators will also assess youth and parent experiences and perceptions of the intervention using inductive qualitative research upon completion of the 16-week trial.

The proposed intervention is mental health support intervention, therefore it does not include medication therapy or devices. The program is being delivered by trained clinical psychologist/psychology students.

Debriefing occurs throughout the intervention to assess for significant mental distress (including but not limited to weekly check-ins). Individual mental health concerns will be dealt with with as they arise. If at any point during the clinical research, clinicians judge the program is no longer beneficial or actively detrimental to an individual's health and wellbeing, the team has the right to end services and provide referrals and support for other treatment models.

Adverse events (AE) will be collected to document unfavorable changes in current health status of the research participant or any incident, experience or outcome that suggests that the research may place participants or others at a greater risk of harm (including physical, psychological, economic or social harm). The AE's that will be reported will include complications from the blood draw (syncopal episode, infection, excessive bleeding requiring medical attention), or events that could be related to completing the mental health questionnaires (emergency visit or crisis resource utilization or hospitalization for suicidal ideation, attempt). All deaths, regardless of cause will also be recorded for participants active in the study.

Sample Size Assessment

Sample size analysis showed that a full-scale trial would require 150 subjects (using a standardized effect size of 0.4 scale change in the self reported quality of life for an individual). The investigators chose to use 10% of this for each pilot (n=15) and added a control arm of n=15 for each pilot as well.

Quantitative Analytic Plan

For feasibility outcomes the investigators will be looking for a minimum 70% adherence (i.e. completing 11/16 sessions) in order to properly test the study hypothesis with a larger trial. A minimum 85% retention rate at follow-up (i.e. percentage of randomized participants that provide outcome measures at follow-up) is needed to protect the original randomization. For estimated effect size of the intervention the investigators will test for group-wise differences in the outcome measures using a repeated measures mixed effects regression model with a random subject effect to account for the within-subject correlations and repeated measures design with outcomes assessed at baseline and 16 weeks. Fixed effects will include treatment, time, and their interaction. An intention to treat strategy will be adopted for the final analysis. The analysis will be underpowered to test for effects for boys and girls separately, however sex as an interaction term in the analysis will be added.

Qualitative Analytic Plan

Youth \& parents/guardian from the DBT intervention arm of both pilot studies (n = 30) will participate in end-point semi-structured interviews of 45-minute duration, guided by Interpretive Description methodology. Interpretive description is a non-categorical applied research approach that seeks to generate understanding of clinically relevant phenomena in relation to its local context. An investigator (M.A) with extensive qualitative research experience will conduct all interviews. Interviews will be conducted via Zoom HealthCare or in-person if allowable. Questions will focus on perceptions of intervention delivery (e.g., duration, dose, timing, interventionist); content (e.g., domains); experiences - including emotional and cognitive responses; and intervention acceptability.

Audio recorded data will be transcribed verbatim and managed using NVivo software (version 1.0). Data from the first three transcripts will inform development of a coding framework which will be applied to subsequent interviews and iteratively revised upon identification of new conceptually distinct codes. Codes will be grouped into thematic clusters with supporting narrative excerpts. Thematic data will be used to refine what the investigators determine as modifiable domains of DBT.