PURSUIT: A Technologically Augmented School-based Program to Improve Child Coping and Prevent Substance Use.

The percentage of youth who complete a post-assessment measure, relative to those who complete a baseline assessment.

Youth will complete a brief, semi-structured interview following a six-week period of engagement with the online self-management portal to assess the feasibility ("Do you think you will be able to integrate these skills into your schedule with school/work?") and acceptability of PURSUIT.

Youth will report their average pain intensity over the past two weeks using a Visual Analog Scale (VAS). Responses range from 0 (no pain) to 10 (worst imaginable pain), with ratings ≥ 3 indicating moderate pain.

The 15-item FDI assesses youths' difficulty performing tasks across home, school, recreational, and social settings over the "past few days" due to physical symptoms. Items are rated from 0 ("no trouble") to 4 ("impossible") and summed, yielding total scores of 0-60 with scores ≥7 suggesting greater than minimal disability

The UCLA Reaction Index for DSM-5 Brief Screening Form is an 11-item measure of how often youth experienced psychological stress and physiological reactivity due to internal or external trauma reminders, intrusive trauma-related memories, avoidance of internal and external reminders of trauma, emotional dysregulation, attention issues, feelings of detachment, and sleep disturbance over the past month. Items are scored from zero (none of the time) to four (most of the time) and summed; scores of 11-20 suggest mild PTSD symptoms, while scores ≥21 are indicative of potential PTSD. We adapted this measure to not query the type of traumatic exposure experienced by youth. It will only be completed by those who endorse exposure (yes/no) to a frightening or upsetting event.

The 41-item Screen for Child Anxiety Related Disorders (SCARED) assesses past 3-month anxiety symptoms. Items are scored on a 3-point Likert-style scale (0 = not true or hardly ever true, 2=very true or often true), and summed to yield total scores of 0-82 with higher scores indicating greater anxiety and scores ≥25 suggesting clinical significance.

Youth will report the frequency (1=never, 5=almost always) of past-week depressive symptoms (e.g., sadness, loneliness) using the eight-item PROMIS Pediatric Depressive Symptoms Short Form 8a. Raw summed scores (range 8 to 40) are converted to T-scores (mean 50, standard deviation 10), with T-scores >55 suggesting mild or higher symptoms.

Past week fatigue symptoms will be self-reported by youth using the 10-item PROMIS Pediatric Short Form. Items ("Being tired made it hard for me to play or go out with my friends as much as I'd like") are rated on a 5-point Likert-style scale (1=never, 5=almost always) and summed in to total scores, which are converted into T-scores (>55 suggesting at least mild symptoms).

The frequency (1=never, 5=almost always) with which youth experienced sleep disturbance symptoms (e.g., trouble falling or staying asleep) in the past week will be assessed using the eight-item PROMIS Pediatric Sleep Disturbance Short Form. T-scores (>55 indicative of mild or greater symptoms) will be derived from summed raw scores.

Youth age 12 and older will report how risky (1= No Risk, 4=Great Risk) they perceive different cigarette, cannabis, alcohol, or vaping use behaviors (e.g., occasional versus regular use) using 12 items from the 2023 Monitoring the Future (MTF) study. MTF is an ongoing longitudinal panel study conducted by the University of Michigan that includes annual surveys of nationally representative samples of 8th, 10,th and 12th grade youth.

The frequency (never, once or twice, monthly, weekly or more often) of past-year nicotine, alcohol, cannabis, and other substance use behaviors will be assessed for youth 12 years and older using the youth-reported Screening to Brief Intervention (S2BI)

The DASS21 depression, anxiety, and stress on a scale of 0-63 with 0 indicating low levels of these feelings, and 63 indicating high levels. This measure will only be completed by caregivers.

Youth will report how often (1=never, 5=almost always) they experienced feelings of stress over the past week using the eight-item PROMIS Psychological Stress Experiences-Short Form 8a. As per other PROMIS short forms, summed scores are converted to T-scores.

A single-item measure completed by the child and caregiver that assesses perceived overall change in the child's status since completing the intervention. Scores range from 1 (Very Much Improved) to 7 (Very Much Worse).

The percent of youth who complete at least one activity within the platform, relative to those who complete baseline assessments.

Youth's lifetime exposure to nine ACEs (e.g., violence, household dysfunction) will be reported by caregivers (if age <18) using items adapted from the National Survey of Children's Health.

Parents/caregivers will report youths' age, sex at birth, racial and ethnic identities, household income, health insurance status/type, and their own highest level of education at baseline.

Parent/caregivers will report the frequency with which their child misses or is late to school due to physical and/or mental health symptoms over the past month at baseline and after engaging with the self-management platform

A brief intake questionnaire assessing whether participants experience pain, worries or sad feelings, and stress at baseline and their reasons for participating in the program.