Here is the design of a clinical trial:

Official Title: Comparison of Explicit Values Clarification Method (VCM), Implicit VCM and no VCM Decision Aids for Men Considering Prostate Cancer Screening: Protocol of a Randomized Trial

Included conditions:
- Healthy Volunteers

Study Armgroups:
- {'label': 'decision aid with information only (control)', 'type': 'NO_INTERVENTION', 'description': 'decision aid with information only, without values clarification method (VCM)'}
- {'label': 'decision aid with implicit VCM', 'type': 'ACTIVE_COMPARATOR', 'description': 'decision aid with information plus an implicit VCM', 'interventionNames': ['Other: Decision aid with implicit values clarification method (booklet or website)']}
- {'label': 'decision aid with explicit VCM', 'type': 'ACTIVE_COMPARATOR', 'description': 'decision aid with information plus an explicit VCM', 'interventionNames': ['Other: Decision aid with explicit values clarification method (booklet or website)']}

Interventions:
- {'type': 'OTHER', 'name': 'Decision aid with implicit values clarification method (booklet or website)', 'description': 'The intervention will be an informative evidence-based material in the format of a booklet or website concerning prostate cancer screening. The values clarification method will be a grid where statements about the subject will be presented (decision aid with implicit VCM).', 'armGroupLabels': ['decision aid with implicit VCM']}
- {'type': 'OTHER', 'name': 'Decision aid with explicit values clarification method (booklet or website)', 'description': 'The intervention will be an informative evidence-based material in the format of a booklet or website concerning prostate cancer screening. The values clarification method will be a a grid where statements about the subject will be presented and men should indicate what statements they identify with (decision aid with explicit VCM).', 'armGroupLabels': ['decision aid with explicit VCM']}

Primary Outcomes:
- {'measure': 'Perceived clarity of personal values', 'description': '3-item subscale of the Decisional Conflict Scale. Items are given a score of 0 ("strongly agree") to 4 ("strongly disagree"). Items are: a) summed; b) divided 3; and c) multiplied by 25. Scores range from 0 \\[feels extremely clear about personal values\\] to 100 \\[feels extremely unclear about personal values\\].', 'timeFrame': 'immediately after the intervention'}

Please estimate the sample size based on the assumption: 
significance level of 0.05, 80% power, 10% dropout rate
Sample size
        We estimated a total sample size of 276 participants, 92 in each group, using the ANOVA test for three groups and considering an average effect size of 0.2 with a significance level of 0.05 and 80% power, attending to the psychometric properties of the DCS and also accounting for 10% of participants leaving the study before conclusion.