Schedule for enrolment, intervention, assessments and follow-up
| Baseline Time 1 | Randomisation | Months 1–5 Coaching begins within 2 weeks of randomisation | Month 6 Time 2 postrandomisation† | Month 7–8 | Month 9 Time 3 3 months±2 weeks of last coaching session‡ | Months 10–11 | Month 12 Time 4 6 months±4 weeks of last coaching session§ |
| Demographics | Demographics (meds and sports involvement only) | Demographics (meds and sports involvement only) | Demographics (meds and sports involvement only) | ||||
| ISCOLE—full | ISCOLE—selected scales | ISCOLE—selected scales | ISCOLE—full | ||||
| 6MWT/6MPT | 6MWT/6MPT | 6MWT/6MPT | 6MWT/6MPT | ||||
| HAES | HAES | HAES | HAES | ||||
| DSQ | DSQ | DSQ | DSQ | ||||
| ASDS | ASDS | ASDS | ASDS | ||||
| PHASES | PHASES | PHASES | PHASES | ||||
| SEHE | SEHE | SEHE | SEHE | ||||
| Body composition* | Body composition* | Body composition* | Body composition | ||||
| FEAHQ-R | FEAHQ-R | FEAHQ-R | FEAHQ-R | ||||
| COPM/GAS (intervention only) | |||||||
| Semistructured survey (all) | COPM/GAS (intervention only) | In-depth interview (intervention participants+their parents only) | Follow-up survey (controls only) | ||||
| PRIME-SP SFFI (intervention only—after each coaching session) | Photovoice (intervention only) 1–2 photos/month (months 7–12) | In-depth interview (intervention + parents only) | |||||
*Body composition: weight, height/length, waist circumference and skinfold thickness.
†Time 2: 6 months±2 weeks from randomisation for Controls.
‡Time 3: 9 months±2 weeks from randomisation. for Controls
§Time 4: 12 months±4 weeks from randomisation for Controls.
6MWT/6MPT, 6 min walk test/6 min push test; ASDS, Arc’s Self-Determination Scale; COPM, Canadian Occupational Performance Measure; DSQ, Dietary Screener Questionnaire; FEAHQ-R, Family Eating and Activity Habits Questionnaire-Revised; GAS, Goal Attainment Scaling; HAES, Habitual Activity Estimation Scale; ISCOLE, International Study of Childhood Obesity, Lifestyle and the Environment Questionnaire; PHASES, Physical activity self-efficacy scale; PRIME-SP, Pediatric Rehabilitation Intervention Measure of Engagement–Service Provider; SEHE, Self-Efficacy for Healthy Eating Scale; SFFI, Solution Focused Coaching Fidelity Instrument.