Hearing Able (control group)

• • 34 people

  • Hearing of 20 dB or less across the frequency spectrum of 250-8000 Hz

Hard of Hearing

• • 45 people

  • Average hearing ability fell between 20 dB - 90 dB over the range of 250 Hz - 8000 Hz

Deaf

• • 32 people

  • No hearing 90 dB or less over the range of 500 Hz to 8000 Hz