I think this is their source: "We estimate that 30.0 million or 12.7% of Americans ≥ 12 years had bilateral hearing loss from 2001–2008, and this estimate incr

I think this is their source: "We estimate that 30.0 million or 12.7% of Americans ≥ 12 years had bilateral hearing loss from 2001–2008, and this estimate increases to 48.1 million or 20.3% when also including individuals with unilateral hearing loss." http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3564588/ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3564588/