Surveys based in the US, England, Australia, and Canada have found the incidence of DMD to be 1 per 3000 to 3500 male births, and 1 per 25,000 for Becker muscular dystrophy.[3] Two-thirds of cases of DMD are inherited from a mother carrying a genetic mutation on the X chromosome at the Xp21 position. One third of cases result from spontaneous mutations. Girls or women with DMD are rare.

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