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Flow chart of participants into study. *n = 764 people were prescribed Metformin only with no Read code for diabetes mellitus; (Metformin is prescribed for other conditions) these patients were not included in the Type 2 diabetes mellitus group; †Main ethnic groups in the study: white British, Irish, Indian, Pakistani, Bangladeshi, black Caribbean and black African. Excluded ethnic minority groups were mainly ‘other’ ethnic groups.
