by C. Robert Pettit, MD
- 1:1,000 U.S. children born with profound deafness
- 3:1,000 born with partial hearing loss
- Half of these are caused by genetic factors
- Most (70 percent to 80 percent) of genetic loss is nonsyndromic (occurs without any other detectable abnormalities)
- In adults, from 1970-2000, hearing loss doubled from 13m à 27m = 1:6
- Chances of developing hearing loss increases with age;
- hearing loss in >50% > 80 years.
British University students’ attitudes towards noise-induced hearing loss caused by nightclub attendance. (Johnson O, Andrew B, Walker D, Morgan S, Aldren A)
In past 30 years, noise-induced hearing loss among adolescents and young adults has increased. This study studied nightclub sound levels > 85 dB. 325 students were questioned regarding frequency of auditory symptoms after nightclub attendance:
- 88% had tinnitus and 66% had impaired hearing next morning.
- 73% said risk of hearing damage would/did not affect their nightclub attendance
- 70% felt noise levels should be limited to safe volumes.