Below is an instruction from Human. Write a response.
    ### Instruction:
    How many people are affected by Canavan disease ?
    ### Response:
    While this condition occurs in people of all ethnic backgrounds, it is most common in people of Ashkenazi (eastern and central European) Jewish heritage. Studies suggest that this disorder affects 1 in 6,400 to 13,500 people in the Ashkenazi Jewish population.
    