During the interviews, the researchers asked parents whether their kids had been diagnosed with autism, ADHD, learning disabilities, cerebral palsy, seizures, stuttering or stammering, hearing loss, blindness, or intellectual disability (formerly known as mental retardation).

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The only disability to decrease was moderate-to-profound hearing loss, which went down 31%.

CNN: CDC: Autism, ADHD rates on the rise

The logic seems inevitable: If an NFL disability board decided 12 years ago after a contested hearing that concussions cause serious damage, the NFL should be legally required to admit now and forever that concussions cause serious damage.

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Personally, I get very tired of hearing somebody has a fix for Social security and now I can add in disability.

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"It's really an invisible disability, " said Laura Hansen, owner of Assist2Hear, a Littleton, Colorado-based hearing assistance company.

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At the beginning of the Games, we were hearing wannabe-positive, slightly uncomfortable-sounding phrases - such as "see the ability not the disability" and "the athletes just want to be taken as seriously as the normal athletes" - from the media.

BBC: Paralympics legacy: Seize the momentum