Читать книгу The Deaf - Harry Best - Страница 10
Age When Deafness Occurred
ОглавлениеThe vast majority of the deaf lost their hearing in early life, and most of them in the tender years of infancy and childhood. More than ninety per cent (90.6, according to the returns of the census) became deaf before the twentieth year; nearly three-fourths (73.7 per cent) under five; over half (52.4 per cent) under two; and over a third (35.5 per cent) were born deaf. Deafness thus occurs in a strongly diminishing ratio with advancing years.[6] These facts may be indicated by the following table,[7] which shows the percentages of those who became deaf at different ages.
THE DEAF ACCORDING TO AGE OF OCCURRENCE OF DEAFNESS
| At birth | 35.5 |
| After birth and under two | 16.9 |
| Under two years | 52.4 |
| 2 and under 4 | 17.1 |
| 4 and under 6 | 7.3 |
| 6 and under 8 | 4.5 |
| 8 and under 10 | 2.8 |
| 10 and under 12 | 1.8 |
| 12 and under 14 | 1.6 |
| 14 and under 16 | 1.3 |
| 16 and under 18 | 1.0 |
| 18 and under 20 | 0.8 |
| Under five | 73.7 |
| 5 and under 10 | 10.5 |
| 10 and under 15 | 4.0 |
| 15 and under 20 | 2.4 |
| Under 20 | 90.6 |
| 20 and under 40 | 5.7 |
| 40 and under 60 | 2.4 |
| 60 and under 80 | 1.1 |
| 80 and over | 0.2 |
