Here is the design of a clinical trial:

Official Title: Michigan Men's Diabetes Project (MenD) - Peer Leader Intervention

Included conditions:
- Diabetes Mellitus, Type 2

Study Armgroups:
- {'label': 'Peer Leader Diabetes Self-Management Support (PLDSMS)', 'type': 'EXPERIMENTAL', 'description': 'Participants in the PLDSMS arm will receive 10 hours of group diabetes self-management education (DSME) with a certified diabetes care and education specialist. After the DSME group sessions, the group will complete 6 1-hour weekly diabetes self-management support (DSMS) session led by two peer leaders.', 'interventionNames': ['Behavioral: Peer Leader Diabetes Self-Management Support', 'Behavioral: Virtual Diabetes Self-Management Education']}
- {'label': 'Control Group', 'type': 'ACTIVE_COMPARATOR', 'description': 'Participants in the control group will receive 10 hours of group diabetes self-management education (DSME) with a certified diabetes care and education specialist.', 'interventionNames': ['Behavioral: Virtual Diabetes Self-Management Education']}

Interventions:
- {'type': 'BEHAVIORAL', 'name': 'Peer Leader Diabetes Self-Management Support', 'description': 'While the effectiveness of peer-led interventions delivering diabetes-related education and support for short-term clinical, psychosocial, and behavioral improvements is well-established, older Black men in particular are less likely to participate and are at a higher risk of drop-out from these studies. This intervention aims to determine if using older Black men as peer leaders to other older Black men will improve retention rates for this population.', 'armGroupLabels': ['Peer Leader Diabetes Self-Management Support (PLDSMS)']}
- {'type': 'BEHAVIORAL', 'name': 'Virtual Diabetes Self-Management Education', 'description': 'Participants will attend 10 hours of virtual group diabetes self-management education classes led by a certified diabetes care and education specialist through the online HIPPA compliant Zoom, Med platform.', 'armGroupLabels': ['Control Group', 'Peer Leader Diabetes Self-Management Support (PLDSMS)']}

Primary Outcomes:
- {'measure': 'Hemoglobin A1C', 'description': 'This outcome measure is change in hemoglobin A1C measured using the DCA 2000 point-of-care testing instrument (value at 3 months minus value at baseline).', 'timeFrame': '3 months'}
- {'measure': 'Self-Care Activities', 'description': 'This outcome measure is change in self-care activities as measured by the Summary of Diabetes Self-Care Activities (SDSCA) scale (value at 3 months minus value at baseline). The SDSCA measure is a brief self-report questionnaire of diabetes self-management that includes items assessing the following aspects of the diabetes regimen: general diet, specific diet, exercise, blood-glucose testing, foot care, and smoking. The range for the general diet, specific diet, exercise, blood-glucose testing, and foot care sub scales included below is 0 to 7. Higher scores are indicative of more frequent self-care activities compared to lower scores.', 'timeFrame': '3 months'}

Please estimate the sample size based on the assumption: 
correlations of 0.25 between successive measurements of A1C, power of 0.8, 20% attrition
Sample size
        
          Power analysis
          Assuming 20% attrition, we expect a final sample size of 48 (excluding the four participants designated as peer leaders), approximately 12 per group (with 2 groups in the treatment arm). If we assume correlations of 0.25 between successive measurements of A1C, then this sample size will yield power of 0.8 to detect a difference of 0.6 standard deviation between average values of A1C in treatment and control groups.