Here is the design of a clinical trial:

Official Title: The Effects of a Peer Co-led Educational Programme for Parents of Children With ADHD: A Feasibility Randomized Controlled Trial

Included conditions:
- Attention Deficit Disorder With Hyperactivity

Study Armgroups:
- {'label': 'Peer co-led educational group', 'type': 'EXPERIMENTAL', 'description': "The intervention delivered in a group format is added to treatment as usual. After the parents participate in the one day-intervention, they can continue in self-help groups, which meet once a week for a 2-hour evening session. User representatives lead these weekly self-help groups, which do not require user-fees and aim to offer practical tools, support and information to increase the parent's skills, knowledge and confidence.", 'interventionNames': ['Behavioral: Peer co-led educational group']}
- {'label': 'Control group', 'type': 'OTHER', 'description': 'The control goup will receive treatment as usual.', 'interventionNames': ['Behavioral: Comparator treatment as usual']}

Interventions:
- {'type': 'BEHAVIORAL', 'name': 'Peer co-led educational group', 'description': "The intervention is delivered in a group format, which takes the form of a full day's training, focusing on ADHD diagnosis, its treatment, how to cope with the challenges related to living with ADHD, as well as coping with challenges of parenting a child with chronic health conditions. After this one day-intervention, the participants can continue in self-help groups, which meet once a week for a 2-hour evening session. User representatives lead these weekly self-help groups, which do not require user-fees and aim to offer practical tools, support and information to increase the parent's skills, knowledge and confidence. Participants are encouraged to adopt an active role in order to achieve a positive parent/provider partnership.", 'armGroupLabels': ['Peer co-led educational group']}
- {'type': 'BEHAVIORAL', 'name': 'Comparator treatment as usual', 'description': 'Control group will receive treatment as usual, including different treatment options that can help alleviate the symptoms of ADHD and arm families with the tools needed to better handle problem behaviors when they arise. These interventions include: medication, psychotherapy, or a combination of these two approaches.', 'armGroupLabels': ['Control group']}

Primary Outcomes:
- {'measure': 'Feasibility of recruitment', 'description': 'Feasibility of recruitment will be assessed by determining the recruitment rate, by monitoring patient screening and subsequent agreement to participate.', 'timeFrame': 'Over a two year study period'}
- {'measure': 'Satisfaction with the intervention', 'description': 'Parent satisfaction will be measured by means of the client satisfaction Questionnaire, CSQ-3 as it applies to the group-based educational programme. The scale comprises three items measured on a scale from 1 (not satisfied) to 4 (very satisfied).', 'timeFrame': 'From baseline to 12- and 52-weeks follow-up'}
- {'measure': 'Parental activation', 'description': "Parental activation will be measure with the P-PAM-13. The 13-items P-PAM has four possible response options ranging from (1) strongly disagree, to (4) strongly agree, and an additional 'not applicable' option.", 'timeFrame': 'From baseline to 12- and 52-weeks follow-up'}

Please estimate the sample size based on the assumption: 
Not explicitly stated in the provided paragraph.
Sample size and statistical power calculation
          The sample size in this study is related to the number of patients required for enrolment, opinions about the questionnaires and satisfaction with the intervention. Consequently, the anticipated sample will be 50 parents, that is, 25 parents in each arm.