Who: Test Subjects
Hearing Able (control group)
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34 people
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Hearing of 20 dB or less across the frequency spectrum of 250-8000 Hz
Hard of Hearing
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45 people
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Average hearing ability fell between 20 dB -90 dB over the range of 250 Hz - 8000 Hz
Deaf
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32 people
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No hearing 90 dB or less over the range of 500 Hz to 8000 Hz