Note 59 — Chapter II
Reading edition
Census Reports, 1880. Report on Defective, Dependent and Delinquent Classes of the Population of the United States, 1888, p. 402ff.; Census Reports, 1890. Report on Insane, Feeble-minded, Deaf and Dumb and Blind, 1895, pp. 108ff., 684; Special Reports, 1906, p. 122. The ages of the deaf were reported less fully in 1880 than in 1890, and less fully in 1890 than in 1900; and if we take the numbers of those whose ages were reported in these three censuses, we have the following table, showing the proportion of the congenitally deaf.
THE CONGENITALLY DEAF ACCORDING TO NUMBERS IN WHICH AGE WAS REPORTED
Number Whose Age Was ReportedCongenitally DeafPer Cent
188022,47312,15554.7
189037,20416,86645.8
190035,47912,60935.3
If we assume that the proportion of the congenitally deaf to all the deaf in each census was the same that it was among the cases in which the age of the occurrence of deafness was reported, we have this table to show the number of the congenitally deaf and the ratio of the deaf among the population.
THE CONGENITALLY DEAF ACCORDING TO NUMBERS ASSUMED
Assumed Number of Congenitally DeafRatio Per Million of Population
188018,531369
189018,375293
190013,286175
These tables are taken from Annals, li., 1906, p. 487.