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Prevalance of Scleroderma: Estimates for the number of people in the United States with systemic sclerosis range from 40,000 to 165,000. By contrast, a survey that included all scleroderma-related disorders, including Raynaud's phenomenon, suggested a number between 250,000 and 992,500.bout prevalence and incidence statistics: The term 'prevalence' of Scleroderma usually refers to the estimated population of people who are managing Scleroderma at any given time.
Myasthenia gravis is relatively rare: the incidence rate is 2 to 5 new cases each year per million of individuals. The prevalence rate is estimated to be approximately 5 out of 100, 000 individuals, or 3000 to 4000 individuals diagnosed with myasthenia gravis in France.