Here is the design of a clinical trial:

Official Title: Study of the Factors Favoring the Transition From Prediabetes to Diabetes on Reunion Island. Impact of the "Say No to Diabetes" Intervention.

Included conditions:
- Diabetes

Study Armgroups:
- {'label': 'prevention program for prediabetes "Say No to Diabetes"', 'type': 'EXPERIMENTAL', 'interventionNames': ['Other: prevention program for prediabetes "Say No to Diabetes"']}
- {'label': 'No prevention program', 'type': 'NO_INTERVENTION'}

Interventions:
- {'type': 'OTHER', 'name': 'prevention program for prediabetes "Say No to Diabetes"', 'description': '10 therapeutic education sessions', 'armGroupLabels': ['prevention program for prediabetes "Say No to Diabetes"']}

Primary Outcomes:
- {'measure': 'The impact of the "Say No to Diabetes" intervention on the incidence of type 2 diabetes', 'description': 'Diabetes : fasting blood glucose ≥ 1.26 g / l (7 mmol / l), or blood sugar 2 hours after taking 75 g of glucose during HGPO ≥2 g / l (11.1 mmol / l)', 'timeFrame': '2 years'}

Please estimate the sample size based on the assumption: 
The study assumes a homogeneous distribution of prediabetic individuals among 1200 GPs, with each GP following between 30 and 60 subjects with prediabetes. The required number of investigating physicians is estimated between 100 and 150 GPs.
Sample size
        To perform sufficiently detailed and powerful analyses, we chose to include 2000 subjects. The results of the CONSTANCES study presented at the 2018 French Society of Diabetology congress estimated that 7.5% of the population aged 18â70 years in Mainland France is prediabetic, a prevalence 1.5 times higher than that of treated diabetics.18 These results allow us to estimate the number of Reunionese individuals with pre-diabetes of the same age group to between 37â600 (7.5% of the age group as in Mainland France) and 75â300 (15% of the age group due to the twice-higher proportion of subjects with diabetes), based on the estimation of the Reunionese population age groups by the French National Institute for Statistical and Economic Studies in 2018.19 Considering a homogeneous distribution of these individuals between 1200 GPs (Regional health agency 2017 data),20 each physician would follow between 30 and 60 subjects with pre-diabetes. As recruitment for clinical studies is not routine in primary care, the required number of investigating physicians was estimated between 100 GPs and 150 GPs.