Rehabilitation, Education, and SElf-management for Adolescents After Mild Traumatic Brain Injury

% screened that are eligible

% eligible participants randomized

% participants who complete 70% of the intervention

% participants who complete follow-up assessment

Proportion of participants who view the treatment as logical (credibility) and expect that it will help (expectancy) will be measured by the Credibility Expectancy Questionnaire. Scores range from 6-64 with higher scores reflecting higher treatment credibility and expectancy. A score above the midpoint will be considered acceptable.

This Client Satisfaction Questionnaire is a validated, reliable, 8-item questionnaire used to measure client satisfaction with a particular program or services (range 8-32). Higher scores reflect better treatment satisfaction. A score above the scale midpoint on the Client Satisfaction Questionnaire will be considered acceptable.

The Pediatric Quality of Life Inventory (Peds-QL) will be the primary clinical endpoint for a future efficacy trial. The total scale will be used. Scores ranged from 0-100, with higher scores reflecting better health-related quality of life.

The Health and Behaviour Inventory (HBI) is a 20-item self- report questionnaire of post-concussion symptoms. We will calculate a total score by summing all items. The score ranges from 0-60, with higher scores reflecting higher symptom burden.

The Patient-Reported Outcomes Measurement Information System Pediatric Anxiety Short For 8a is a validated, reliable and sensitive to treatment-related changes tool that assesses anxiety symptoms in youth. T-scores will be calculated, with higher scores reflecting higher anxiety.

The Patient-Reported Outcomes Measurement Information System Pediatric Depressive Symptoms Short Form 8a will be used to asses depression. It is a validated, reliable and sensitive to treatment-related changes tool that assesses depression symptoms in youth. T-scores will be calculated, with higher scores reflecting higher depression

A pain rating scale will be used to assess pain intensity, distress, and location. Pain intensity is scores on a scale from 0 to 10, with higher scores reflecting greater intensity. Pain distress is scored on a scale from 0 to 10, with higher scores reflecting greater pain related distress. Pain location will be scores by totaling the number of areas where the individual is affected by pain, with higher scores reflecting pain in more parts of the body.

Child Acceptance and Mindfulness Measure (CAMM) is a 10 item measure of dispositional mindfulness originally designed for use for youth aged 10-17. Scores range from 0-40, where higher scores correspond to higher train mindfulness.

The Pediatric Fear Avoidance after Traumatic Brain Injury Questionnaire (PFAB-TBI) is a 16-item measure of fear-avoidance behaviours after traumatic brain injury in children and youth. Scores range from 0-48, with higher scores reflecting more fear avoidance behaviour.

The Avoidance and Fusion Questionnaire for Youth (AQ-Y8) is an 8-item measure that assesses psychological flexibility in youth ages 9-17. Scores range from 0-32, where higher scores indicate higher psychological inflexibility engendered by high levels of cognitive fusion and experiential avoidance.

The PROMIS Pediatric Pain Interference consists of 13 items related to how pain interfere with a child's day-to-day life. Scores range from 0-30, where higher scores will reflect more symptom interference.

The Five-Factor Model - Adolescent Personality Questionnaire (FFM-APQ) is a 25-item questionnaire, 5 for each personality trait tested with 12- to 17-year-olds. Subscale scores will be calculated for each trait, where higher scores reflect stronger trait endorsement.

The Global Impression of Change (Score) is a single item asking participants to reflect on change post-intervention. Scores ranges from 1 to 7, with higher scores reflecting more positive change.

The PedsQL-MFS scale measures general fatigue, sleep/rest fatigue, and cognitive fatigue. Items are totaled and transformed to a 0-100 scale. Higher scores reflect fewer fatigue symptom.