REACHOUT Mental Health Support Mobile App

Perceived Social Support will be assessed using the Diabetes-Specific Perceived Social Support Scale. This scale presents a list of ways that people give and receive support, and asks participants to indicate the degree to which each statement is true for them. Participants may rate each item from 0 indicating No Support to 4 indicating a Great Deal of Support. A higher score indicates higher perceived social support.

Depressive Symptom Severity will be assessed using the Personal Health Questionnaire 8 (PHQ-8). This questionnaire asks participants how bothered they have been by various problems over the past two weeks. Participants rate each item from 0 indicating Not At All to 3 indicating Nearly Every Day. A total score is calculated by adding up the ratings for each item. A higher score indicates higher depressive symptom severity.

Resilience will be assessed by the Diabetes Strengths and Resilience (DSTAR) Measure for Emerging Adults. The scale presents a list of items that people with diabetes sometimes think. Items are scored on a 5-point Likert scale from never "1" to almost always "5". A total score is calculated by taking a sum of all items. A higher score indicates higher resilience.

Diabetes-Specific Quality of Life will be measured by the Type 1 Diabetes Activities and Living (T1DAL). The survey questions ask participants what their life is like with diabetes including what is going well for them or what they could use more help with. There are different variations of the questionnaire for each of the following age cohorts: 18 - 25 years old, 26 - 45 years old, 46 - 60 years old, > 60 years old. Participants answer each item with the following options: (1) No, not at all true; (2) No, not very true; (3) Sometimes true, sometimes not true; (4) Yes, a little true; (5) Yes, very true.

Health-Related Quality of Life will be measured by the EuroQol-5D-5 level version (EQ-5D-5L), which asks questions regarding general health. Participants are asked to choose from a variety of statements for each question which best describes their health.

Change Quality Adjusted Life Year (QALY) will be estimated using the Visual Analogue Scale (VAS) of the EuroQol-5D-5 level version (EQ-5D-5L). The VAS asks participants to self-rate their health on a vertical visual analogue scale, where the endpoints are labelled 'The best health you can imagine' and 'The worst health you can imagine'.

Change in Health Related Costs will be measured by the Health Resource Utilization Questionnaire (HRU). This questionnaire asks a series of questions regarding health resource utilization and costs patients may have incurred.

Hemoglobin A1c (HbA1c) will be measure via blood collection

In British Columbia, the continuous glucose monitor (CGM) brands that are covered by provincial health care are the Dexcom G6, G7, and Freestyle Libre 2. As such, we will request to collect % time in range data from all participants who are using this CGM. Because the CGMs are pre-calibrated by the factory, participants do not need to self-calibrate. CGM units will be retrieved by the research team using Dexcom Clarity software (Dexcom, San Diego, CA), LibreView. We will also request participants who are using Glooko to share their data with us by uploading their data onto their Glooko account. In order to understand blood glucose fluctuations, we will collect 14 days of CGM glucose data at two timepoints: 1) baseline and 2) 6 months. The first day will be considered as the date of the baseline and 6-month assessments.