Agile Development of a Digital Exposure Treatment for Youth With Chronic Musculoskeletal Pain

Assessment of Acceptability of Treatment Content and Digital Delivery Questionnaire - Likert Scale (Aim 1 and Aim 2)

时间窗: Baseline through 3-month follow-up (up to 22 weeks)

Participant-rated acceptability measured on 5-point Likert scale. Range 0-4 (higher scores indicate more acceptable). Questionnaire will be administered to youth with chronic pain and their parents.

Assessment of Acceptability of Treatment Content and Digital Delivery Questionnaire - Participant Responses (Aim 1 and Aim 2)

时间窗: Baseline through 3-month follow-up (up to 22 weeks)

Acceptability will be assessed qualitatively through participant responses to open-ended questions related to acceptability, ease of use, comprehensibility, and suggestions for improvement. Responses will be assessed categorically by the investigator. Questionnaire will be administered to youth with chronic pain and their parents.

Participant Satisfaction with the Intervention (Aim 1 and Aim 2)

时间窗: 19 weeks (Assessed at the end of treatment)

Treatment satisfaction at the end of treatment will be evaluated by examining mean satisfaction scores on an adapted version of the Pain Service Satisfaction Test (PSST, McCracken et al., 1997). The PSST consists of 23 items rated on a 5-point Likert Scale (0 = not at all satisfied to 4 = very satisfied) and assesses the patient and parent's experience of the intervention. Scores range from 0-92. A score greater than/equal to 40 of 60 (satisfied to very satisfied) will indicate high levels of satisfaction with the intervention content.

Percentage of Participants Dropped Out of Intervention (Aim 2)

时间窗: 19 weeks (Assessed at the end of treatment)

As a measure of treatment adherence, we will calculate the percentage of participants who drop out or withdraw from the intervention prior to completion of the intervention.

Expectations for Treatment (Aim 2)

时间窗: Baseline (up to 2 minutes to complete the survey)

Participants (child) and parent expectations for treatment will be measured by the Treatment Expectancy and Creditability, Borkovec \& Nau, 1972). The TEC is comprised of 6 items rated on a 0 to 10 Likert-scale assessing expectations related to the effectiveness of the current treatment. The TEC is completed by the patient at the end of the first treatment session. Higher scores indicate greater expectations for treatment effectiveness.

Functional Disability (Aim 2)

时间窗: Baseline through 3-month follow-up (up to 22 weeks)

Functional disability will be assessed using the Functional Disability Inventory (FDI, Walker \& Greene, 1991), a 15-item self-report measure of perceived difficulty in performing activities in school, home, physical, and social contexts. Items are rated on a 5-point Likert scale ranging from 0 (no trouble) to 4 (impossible). Items are summed to create a total score (range 0-60), with higher scores indicating greater disability.

Assessment of Acceptability of Treatment Content - Likert Scale (Aim 1)

时间窗: One day

Participant-rated acceptability measured on 5-point Likert scale. Range 0-4 (higher scores indicate more acceptable). Questionnaire will be administered to youth with chronic pain and their parents.

Participant Satisfaction With the Intervention (Aim 2)

时间窗: 10 weeks (assessed at discharge)

Treatment satisfaction at the end of treatment will be evaluated by examining mean satisfaction scores on an adapted version of the Pain Service Satisfaction Test (PSST, McCracken et al., 1997). The PSST consists of 23 items rated on a 5-point Likert Scale (0 = not at all satisfied to 4 = very satisfied) and assesses the patient and parent's experience of the intervention. Scores range from 0-92. A score greater than/equal to 40 of 60 (satisfied to very satisfied) will indicate high levels of satisfaction with the intervention content. Caregivers were not assessed for this Outcome Measure.

Percentage of Participants Dropped Out of Intervention (Aim 2)

时间窗: 10 weeks (Completed at discharge)

As a measure of treatment adherence, we will calculate the percentage of participants who drop out or withdraw from the intervention prior to completion of the intervention.

Expectations for Treatment (Aim 2)

时间窗: Assessed seven days after starting the intervention (7 days post-baseline)

To assess expectations for treatment effectiveness, participants completed the Credibility/Effectiveness Questionnaire (CEQ; Borkovec \& Nau, 1972) after engaging with iGET Living for one week. The CEQ consists of six items rated on a 0 (not at all) to 10 (very much) Likert scale and assesses expectations related to the effects of the intervention across two subscales: Credibility (e.g., "How confident would you be recommending iGET Living to a friend with the same problems?") and Expectancy (e.g., "By the end of iGET Living, how much do you think your functioning will improve?"). Credibility is calculated by summing items 1-3 and Expectancy by summing items 4-6. Possible range of scores for each subscale is 0-30, with higher scores reflecting greater perceived credibility and expectancy.

Functional Disability (Aim 2)

时间窗: Baseline (Day 7), Discharge (10 weeks post-baseline), and 3-month follow-up (12 weeks post-discharge)

Functional disability will be assessed using the Functional Disability Inventory (FDI, Walker \& Greene, 1991), a 15-item self-report measure of perceived difficulty in performing activities in school, home, physical, and social contexts. Items are rated on a 5-point Likert scale ranging from 0 (no trouble) to 4 (impossible). Scores from all the Items are summed to create a total score (range 0-60), with higher scores indicating greater disability.