Baseline data collection
| Demographics | |
| Date of birth | Open response |
| Gender | Male/female |
| Ethnic category national coding56 | Select most appropriate response option(s) |
| School/work situation (three questions: school/training, part-time/full-time work, not in any type of work or education) | Yes/no response |
| Satisfaction with school/work/college | Four response options (‘very satisfied’ to ‘very dissatisfied’) |
| Screen time57 | Six response options (‘none’ to ‘>5 hours’) |
| Physical activity.57 In the past week, the number of times per day you have done a total of 30 min or more of physical activity | Five response options (‘<1 time/day’ to ‘>5 times/day’) |
| Comorbidities: Other health problems/illnesses (12 conditions and 2 open response) | Location of other bodily pains recorded on body chart |
| Details about the consultation for the musculoskeletal condition | |
| Location of pain for consultation58 | Body chart |
| Is this pain still present? Duration of other bodily pains Is this the first episode of pain? | Yes/no response Four response options (‘<1 week’ to ‘>12 weeks’) Yes/no response |
| Mechanism of injury | Four response options (accident/injury; gradual onset with no injury; sudden onset with no injury; do not know/unable to recall) |
| Treatment provided: medications, advice/education, referral to healthcare professional, imaging referral (yes/no with free text to capture details) | Yes/no response+additional open response |
| Pain outcomes | |
| Pain intensity: Current pain34 Usual pain intensity over last 7 days34 | NRS (0–10 scale) |
| Bothersomeness35 | Five response options (‘not at all’ to ‘extremely’) |
| Visual pain trajectories59 | Seven graphical response options indicating differing pain patterns. Select option that best reflects their pain experience. |
| Psychological outcomes | |
| Child self-efficacy scale60 | Seven items, five responses (‘very sure’ to ‘very unsure’) |
| Single items from Fear of Pain Questionnaire61 | Three items, three responses ("I do not agree", "I am not sure", "I agree with this") |
| Functional/activity limitation | |
| Paediatric pain screening tool62 | Nine items, eight items (‘agree’ or ‘disagree’), one item five response options (‘not at all’ to ‘a whole lot’) |
| FDI63 | Fifteen items, five response options (‘no trouble’ to ‘impossible’) |
| Chronic pain grade scale: 0–10 interference with usual activities64 65 | Numerical rating scale (0–10 scale) |
| Sleep: Duration Quality: trouble falling asleep, waking in the night, trouble staying asleep, waking feeling tired and worn out66 | Usual bed/wake time Four items, three response options (‘not at all’, ‘on some nights’, ‘on most nights’) |
| Health-related quality of life (HRQoL) | |
| KIDSCREEN-2740: five domains: physical activities and health, general mood and feelings about yourself, family and free time, friends, school and learning | Twenty-seven items, five response options (‘not at all’ to ’extremely’). Higher score=higher HRQoL |
| Interview acceptability | |
| Ease of interview | Five response options (‘very difficult’ to ‘very easy’) |
| Acceptability of interview duration | Three response options (‘too short’, ‘just right’, ‘too long’) |
| Willingness to participate in future research | Three response options (‘yes’, ‘maybe’, ‘no’) |
| Preferences for research involvement: Frequency of contact Method of contact, seven options | Six response options (‘daily’ to ‘monthly’, option of free text) Yes/no response to each |
| CAM-Pain 6-week follow-up preferences | |
| Follow-up preferences | Three response options (‘phone’, ‘email’, ‘mail’) |
CAM-Pain, child and adolescent musculoskeletal pain; FDI, functional disability inventory; NRS, numerical rating scale.