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5. Frequency

The frequency of Waardenburg syndrome differs according to type. Type 1 and 2 are most frequent, whereas type 3 and 4 are rare. The overall incidence is about 1 in 50,000 people. In 2002, there were only 48 cases of type 4. In schools for the deaf, about 1 out of 30 students will have Waardenburg syndrome.

Genetic frequency cosmin4000 / Getty Images

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