Table 2.
Summary of primary and secondary outcome measures.
| Outcome | Measurement | Description | Length |
| Mindfulness skills acquisition (primary outcome)a | Mindful Attention Awareness Scale for Adolescents (MAAS-A) [41] | 14-item scale evaluating level of mindfulness as a quality of attention informed by an awareness of the present experience | Approximately 3 min |
| Illness perceptiona | Illness Perception Questionnaire (brief) [47] | 9-item measure of health-related quality of life for adolescents including those with acute and chronic health conditions. Provides an overview of how the illness is affecting overall level of functioning | Approximately 3 min |
| Mood and anxietya | Depression Anxiety Stress Scale (DASS-21) [48] | 21-item scale assessing mood and anxiety symptoms in adolescents based on self-evaluation of symptoms in the past 7 days | Approximately 5 min |
| Self-esteema | Rosenberg Self Esteem Scale [49] | 10-item scale assessing self-esteem and overall satisfaction with life | Approximately 3 min |
| Stress (biological marker) | Salivary cortisol levels [42] | Self-collected saliva samples using cotton swabs (Salivettes). Analysis by immunoassay | 1 minute per sample |
| Individual practice | Data reported in participant log books | Participants will be encouraged to detail individual home practice in a digital log book noting frequency, duration, and type of practice | Approximately 5 min per week |
| Participant appreciation | Verbatim transcription of semistructured interviews | Individual interviews with study participants will be conducted at the end of the 8-week MBIb using the Zoom eHealth platform | 15 to 30 min |
| Facilitator feedback | Data reported in facilitator log books | Facilitators will use pre- and postsession log books to detail impressions and adaptations of the MARS-Ac program for the eHeath platform | Approximately 15 min per entry |
aAll measurement scales included in this table have been validated in clinical youth populations and have shown favorable psychometric profiles (Cronbach alpha>.80).
bMBI: mindfulness-based intervention.
cMARS-A: Mindful Awareness and Resilience Skills for Adolescents.