Here is the design of a clinical trial:

Official Title: Families First Positive Discipline for Everyday Parenting With Home Visiting Program in Indonesia

Included conditions:
- Child Abuse
- Parent-Child Relations

Study Armgroups:
- {'label': 'Families First Home Visiting Program', 'type': 'EXPERIMENTAL', 'description': '10 group sessions conducted weekly and 4 home visits for the duration of the program. Sessions and visits of the Families First Home Visiting Program cover child development, parenting skills, parent-child communications, and positive discipline practices. The intervention is delivered by para-professional community facilitators, trained in the program.', 'interventionNames': ['Other: Families First Home Visiting Program']}
- {'label': 'Control Group', 'type': 'NO_INTERVENTION', 'description': 'The control group receives the standard, government run, services provided by community health workers in West Java. Once the evaluation of the intervention arm is completed, participants in the control arm will be offered the intervention.'}

Interventions:
- {'type': 'OTHER', 'name': 'Families First Home Visiting Program', 'description': '10 group sessions and 4 home visits with community facilitators emphasizing positive parenting', 'armGroupLabels': ['Families First Home Visiting Program']}

Primary Outcomes:
- {'measure': 'Change in frequency of physical and emotional punishment at 3 and 6 months', 'description': 'Self-report frequency in the past month of use of physical discipline including harsh physical discipline, and verbal/emotional discipline.', 'timeFrame': 'Baseline, post-intervention (3 months), and 6 months follow-up'}

Please estimate the sample size based on the assumption: 
Significance level (α) of 0.05, 90% power, 0.02 intraclass correlation, and 80% participation rate.
Statistical analysis and sample size calculation
        The study is powered to detect a change considered to be both meaningful and plausible on the primary outcome. A sample size of 720 families will allow measuring a reduction of 15.2% in parent-reported use of violent discipline at home from the initial estimated prevalence of 30% (SKTA 2013)4 with an Î± level of 0.05% and 90% power, assuming 0.02 intraclass correlation73 74 and 80% participation rate.75 One child per family will be selected as the index child.