The Prevalence and Incidence of Hearing Loss in Children - (webpage) report produced by the Association of Speech-Language-Hearing Association (ASHA).
The Prevalence and Incidence of Hearing Loss in Adults - (webpage) report produced by the Association of Speech-Language-Hearing Association.
Institute of Education Sciences (IES) -- (website) was established within the U.S. Department of Education to provide relevant research, evaluation and statistics to our nation's education system. [Enter search terms at website.]
ASHA Statistics Resources page -- (website) provides information on general statistics, and on statistics used in clinical practice research for assessment evaluation, group designs, and single-subject designs. (See the Electronic Statistics Textbook by StatSoft.)
Statistics on Voice Speech and Language - (webpage) report produced by the National Institute on Deafness and Other Communication Disorders, one of the government's National Institutes of Health.
Statistics and Epidemiology - (webpage) contains quick stats, charts, tables and references from the NIDCD on disorders of voice, speech, and language.