The Chronic Pain Acceptance Questionnaire (CPAQ-R) consists of 20 items, with 10 items each for the subscales of Activity Engagement and Pain Willingness. The items on the CPAQ are rated on a 7-point scale from 0 (never true) to 6 (always true). Higher scores indicate higher levels of acceptance.

The Hospital Anxiety and Depression Scale is a 14-item scale with seven items each for the anxiety and depression symptom subscales. For both subscales, a score of 8-10 indicates mild symptoms, 11-14 indicates moderate symptoms, and 15-21 indicates severe symptoms.

The SF-36 Health Survey is a 36-item, participant-reported survey that measures patient health and disability. Possible scores range from 0 to 100, with 0 indicating maximum disability, and 100 indicating no disability.

The AUDIT-C consists of three questions, and each question has 5 answer choices valued from 0 points to 4 points. The AUDIT-C is scored on a scale of 0-12. A score of 4 for men and a score of 3 for women can raise suspicion of alcohol use disorder.

The 10-item Perceived Stress Scale (PSS) measures global perceived stress experienced by the participant over the preceding 30 days. The questions in this assessment tool ask how often the participant felt or thought a certain way during the past month. Possible answers include: 0 - never; 1 - almost never; 2 - sometimes; 3 - fairly often, and 4 - very often. Possible scores range from 0 to 40, with lower scores indicating a better outcome (less stress).

The System Usability Scale is a 10-item measure of overall usability of the app regarding perceived usefulness and ease of use. The overall score is in a range from 0-100, with a higher score indicating better user satisfaction.

The Everyday Discrimination Scale-Expanded (EDS-E) is a self-report measure used to assess the frequency of various forms of discrimination experienced by individuals in their day-to-day lives. It consists of 10 items, each rated on a 5-point Likert scale from 0 (never) to 4 (very often).