Here is the design of a clinical trial:

Official Title: Promoting Community Reintegration Using Narratives and Skills Building for Young Adults With Stroke

Included conditions:
- Stroke

Study Armgroups:
- {'label': 'Intervention group', 'type': 'EXPERIMENTAL', 'description': 'Eligible participants will be randomly assigned to receive usual care with the novel 24-week Narrative and Skills-building Intervention.', 'interventionNames': ['Behavioral: Narrative and Skills-building Intervention']}
- {'label': 'Usual care group', 'type': 'NO_INTERVENTION', 'description': 'Participants will receive usual stroke care.'}

Interventions:
- {'type': 'BEHAVIORAL', 'name': 'Narrative and Skills-building Intervention', 'description': "The intervention is grounded in Narrative Theory and Bandura's principles of Self-efficacy and Outcome Expectation. It will consist of eight individual sessions over six months delivered by a facilitator. Participants will be facilitated to narrate their survival experiences and rebuild core life skills.", 'armGroupLabels': ['Intervention group']}

Primary Outcomes:
- {'measure': "Change in the participants' level of community reintegration", 'description': "The Chinese version of the Reintegration to Normal Living Index (RNIL-C) will be used to assess the participants' level of community reintegration. It consists of 11 items in eight domains: mobility, self-care, daily work and school activity, recreational and social activities, family roles, personal relationships, presentation of self to others and general coping skills. Participants are asked to rate the extent to which each item describes their situation on a scale from 1 - 'a small extent' to 5 - 'a great extent'. The total score is calculated by summation and normalised to give 100 with a total score range of 25 to 100. A higher score indicates better community reintegration. The RNIL-C has high internal consistency (Cronbach's alpha=0.92) and good convergent validity.", 'timeFrame': 'Change from baseline (T0) to immediately (T1), 6 months (T2) and 12 months (T3) after completion of the intervention'}

Please estimate the sample size based on the assumption: 
The study assumes an 80% power at a two-sided 5% level of significance and allows for a potential attrition rate of up to 20%.
Sample size estimation
        The sample size is estimated based on the outcomes of community reintegration, self-efficacy and outcome expectation. In our previous interventional study [23], the effect sizes of a stroke self-management programme on community reintegration, self-efficacy and outcome expectation of performing self-management behaviours were 0.44, 0.55 and 0.53, respectively. Using the power analysis software PASS 16 (NCSS, LLC. Kaysville, Utah, USA), a sample size of 83 participants per study arm is estimated to give this two-arm RCT 80% power at a two-sided 5% level of significance to detect an effect size as small as 0.44 on the primary outcome between the control and intervention groups at a post-intervention time point. Further allowing for a potential attrition rate of up to 20%, 208 participants, with 104 per group, will be recruited.