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This report of a study of 456 moderately and severely deafened children from the schools for the deaf in London covers 137 pages and includes many charts and graphs. The purposes of the study were threefold: (1) to measure the deafness of deaf children by the more accurate, recently acquired methods; (2) to express the relation between deafness and speech in children, and (3) to estimate the benefit of magnified sounds to severely deaf children.
Of the 456 children, 128 were classed as partially deaf, since they could hear conversation at from 2 to 20 feet, while 328 were unable to hear conversation at 2 feet and were classed as deaf.
Of all the children studied, 42.5 per cent were born deaf, and the cause of deafness in the others was: otitis media associated with a specific fever in 18 per cent, of whom the majority had suffered from measles
Hearing and Speech in Deaf Children.. Am J Dis Child. 1937;54(4):962. doi:10.1001/archpedi.1937.01980040266015