III. CAUSES OF DEAFNESS IN PENNSYLVANIA INSTITUTION FROM 1843 TO 1912
| 1843 1846 | 1847 1850 | 1851 1854 | 1855 1858 | 1859 1862 | 1863 1866 | 1867 1870 | 1871 1874 | 1875 1878 | 1879 1882 | 1883 1886 | 1887 1890 | 1891 1894 | 1895 1898 | 1899 1902 | 1903 1906 | 1907 1910 | 1911 1912 | |
| Total Number | 90 | 111 | 125 | 143 | 167 | 152 | 150 | 178 | 282 | 233 | 261 | 207 | 248 | 250 | 239 | 240 | 282 | 152 |
| Congenital | 54.4 | 58.5 | 56.0 | 46.8 | 53.3 | 48.4 | 40.0 | 42.1 | 31.2 | 24.4 | 34.1 | 47.3 | 46.8 | 41.6 | 32.2 | 35.8 | 33.7 | 34.2 |
| Scarlet Fever | 13.3 | 18.0 | 12.8 | 16.8 | 9.6 | 19.7 | 16.0 | 18.6 | 18.1 | 13.7 | 14.9 | 14.0 | 14.1 | 11.2 | 6.3 | 10.4 | 3.9 | 5.2 |
| Meningitis | — | — | 0.8 | — | — | 2.0 | 1.3 | 9.6 | 18.1 | 25.7 | 16.4 | 5.8 | 5.6 | 7.6 | 8.4 | 7.1 | 17.4 | 15.1 |
| Measles | 1.1 | 2.7 | 1.6 | 2.8 | 2.4 | 3.3 | 4.0 | 1.1 | 1.7 | 2.6 | 1.9 | 3.9 | 3.2 | 4.4 | 4.6 | 4.5 | 3.5 | 3.9 |
| Whooping Cough | 2.2 | 0.9 | 0.8 | 0.7 | 1.2 | 0.7 | 1.3 | 0.6 | 0.3 | 0.8 | — | 0.5 | 0.4 | 0.8 | 1.7 | 0.7 | 2.9 | 1.3 |
| Catarrh | — | 0.9 | — | — | — | — | 0.7 | 0.6 | 2.1 | — | — | 3.9 | 4.8 | 6.8 | 4.2 | 1.2 | 2.5 | 1.3 |
| Brain Fever | — | — | 2.8 | 2.1 | — | 6.0 | 4.7 | — | — | — | 0.8 | 2.9 | 5.2 | 4.0 | 3.4 | 1.7 | 2.9 | 2.6 |
| Typhoid Fever | — | — | — | 1.4 | 0.6 | 0.7 | 2.6 | 2.7 | 2.1 | 2.6 | 3.4 | 2.9 | 3.6 | — | 2.5 | 0.7 | 3.9 | 1.3 |
| Diphtheria | — | — | — | — | — | — | 0.7 | — | — | — | — | 0.5 | 1.6 | 2.0 | 0.8 | 2.5 | 1.2 | 2.0 |
| Pneumonia | — | — | — | — | — | — | — | — | — | — | — | 0.5 | — | — | 0.8 | 0.4 | 1.2 | 4.8 |
| La grippe | — | — | — | — | — | — | — | — | — | — | — | — | 0.4 | — | 2.1 | 1.2 | 0.3 | — |
| Mis. and Unknown | 29.0 | 19.2 | 25.2 | 29.4 | 32.9 | 19.2 | 28.7 | 24.7 | 26.3 | 30.2 | 28.5 | 17.8 | 14.3 | 21.6 | 33.0 | 33.8 | 26.6 | 28.3 |
IV. CAUSES OF DEAFNESS IN WESTERN PENNSYLVANIA INSTITUTION FROM 1887 TO 1912
| 1887 1888 | 1889 1890 | 1891 1892 | 1893 1894 | 1895 1896 | 1897 1898 | 1899 1900 | 1901 1902 | 1903 1904 | 1905 1906 | 1907 1908 | 1909 1910 | 1911 1912 | |
| Total Number | 61 | 56 | 58 | 58 | 49 | 40 | 50 | 41 | 110 | 59 | 73 | 71 | 73 |
| Congenital | 24.6 | 14.3 | 20.7 | 32.8 | 46.9 | 40.6 | 40.0 | 31.9 | 38.2 | 25.4 | 30.1 | 40.9 | 36.5 |
| Scarlet Fever | 9.8 | 21.4 | 8.6 | 10.4 | 10.2 | 5.0 | 6.0 | 12.2 | 8.3 | 11.8 | 8.2 | 11.3 | 12.7 |
| Meningitis | 16.5 | 14.5 | 13.8 | 10.4 | 10.2 | 20.0 | 14.0 | 17.1 | 7.2 | 10.2 | 13.7 | 14.1 | 9.6 |
| Measles | 4.9 | 1.9 | 5.2 | 10.4 | 4.0 | — | 2.0 | 2.4 | 7.2 | 1.9 | 8.2 | 2.8 | 6.8 |
| Catarrh | 3.2 | — | 7.6 | 1.9 | 2.0 | 5.0 | 2.0 | 9.6 | 2.7 | 3.8 | 4.1 | 2.8 | 1.8 |
| Brain Fever | 6.5 | 5.4 | 1.9 | 1.9 | — | 2.5 | — | 4.8 | 2.7 | 5.1 | 2.8 | 1.4 | 4.1 |
| Typhoid Fever | — | 1.9 | 5.2 | — | 6.0 | 2.5 | — | — | 1.8 | 1.9 | 4.1 | 2.8 | — |
| Whooping Cough | 1.6 | — | 1.9 | — | 2.0 | — | 6.0 | 2.4 | 1.8 | 1.9 | 2.8 | — | 1.8 |
| Diphtheria | 1.6 | — | 1.9 | — | — | — | 4.0 | 2.4 | 1.8 | — | 1.4 | 1.4 | 1.8 |
| La grippe | — | — | — | — | 2.0 | — | 2.0 | — | — | 1.9 | — | — | — |
| Pneumonia | — | — | — | — | — | 2.5 | 2.0 | — | — | 1.9 | 1.4 | — | — |
| Miscellaneous and Unknown | 31.3 | 30.6 | 33.2 | 32.2 | 16.7 | 22.5 | 22.0 | 17.2 | 28.3 | 34.2 | 23.2 | 22.5 | 24.9 |
V. CAUSES OF DEAFNESS IN MARYLAND SCHOOL FROM 1884 TO 1911
| 1884 1885 | 1886 1887 | 1888 1889 | 1890 1891 | 1892 1893 | 1894 1895 | 1896 1897 | 1898 1899 | 1900 1901 | 1902 1903 | 1904 1905 | 1906 1907 | 1908 1909 | 1910 1911 | |
| Total Number | 28 | 27 | 25 | 25 | 29 | 30 | 30 | 39 | 29 | 30 | 28 | 41 | 32 | 135[37] |
| Congenital | 46.4 | 62.9 | 44.4 | 36.0 | 37.9 | 43.3 | 43.3 | 61.5 | 44.8 | 43.3 | 57.1 | 53.7 | 34.4 | 51.8 |
| Meningitis | 10.7 | 11.1 | 8.0 | 12.0 | 10.3 | 10.6 | 6.7 | 2.6 | 14.0 | 3.3 | 3.6 | 2.4 | 12.2 | 8.1 |
| Scarlet Fever | 10.7 | 7.4 | 12.0 | 16.0 | — | — | 6.7 | 5.2 | 3.5 | 10.0 | 7.2 | 9.6 | 3.1 | 1.4 |
| Measles | 3.6 | — | — | — | 3.5 | 3.3 | 6.7 | — | 3.5 | 3.3 | — | — | 3.3 | 2.2 |
| Diphtheria | — | — | — | — | 3.5 | 3.3 | 3.3 | 2.6 | — | 3.3 | 3.6 | — | — | 0.7 |
| Catarrh | — | — | — | — | 3.5 | 3.3 | 3.3 | 5.2 | 3.5 | — | — | — | — | — |
| Typhoid Fever | — | — | 4.0 | — | — | — | — | — | — | 6.7 | — | 2.4 | 3.1 | 2.2 |
| Whooping Cough | 3.6 | — | — | — | — | — | — | — | 3.5 | — | — | — | 3.1 | 1.4 |
| Pneumonia | 3.6 | — | — | — | — | — | — | — | 7.0 | — | 3.6 | 2.4 | 3.1 | 2.2 |
| Brain Fever | 7.2 | — | 4.0 | 8.0 | 3.5 | 3.3 | — | — | 7.0 | 3.3 | — | 4.8 | — | 2.9 |
| Various Fevers | — | — | 4.0 | 8.0 | 3.5 | — | — | 2.6 | — | 3.3 | 3.6 | 4.8 | — | 2.2 |
| Miscellaneous and Unknown | 14.2 | 18.6 | 23.6 | 20.0 | 34.3 | 32.9 | 28.1 | 22.0 | 16.7 | 23.5 | 21.3 | 19.9 | 37.7 | 24.1 |
VI. CAUSES OF DEAFNESS IN WISCONSIN SCHOOL FROM 1879 TO 1908
| 1879 1880 | 1881 1882 | 1883 1884 | 1885 1886 | 1887 1888 | 1889 1890 | 1891 1892 | 1893 1894 | 1895 1896 | 1897 1898 | 1899 1900 | 1901 1902 | 1903 1904 | 1905 1906 | 1907 1908 | |
| Total Number | 36 | 66 | 231[37] | 56 | 67 | 50 | 44 | 72 | 64 | 72 | 62 | 33 | 33 | 63 | 70 |
| Congenital | 14.3 | 31.8 | 35.1 | 35.7 | 49.3 | 38.0 | 50.0 | 40.3 | 53.1 | 52.7 | 64.3 | 33.3 | 48.4 | 34.9 | 40.0 |
| Meningitis | 27.7 | 33.3 | 37.7 | 33.9 | 28.3 | 32.0 | 15.9 | 12.5 | 31.2 | 19.4 | 16.1 | 9.1 | 3.0 | 6.3 | 5.7 |
| Scarlet Fever | 14.3 | 6.0 | 12.5 | — | 8.9 | 12.0 | 20.4 | 11.1 | 4.7 | 6.9 | 4.7 | 6.1 | — | 9.5 | 8.6 |
| Measles | 12.8 | 3.0 | 1.5 | — | 2.9 | — | 2.3 | 4.1 | 3.1 | — | — | 3.0 | 3.6 | 1.6 | 4.3 |
| Typhoid Fever | — | 6.0 | 7.4 | 1.8 | — | 2.0 | 2.3 | — | 1.6 | — | 3.2 | 6.1 | — | 3.2 | 1.4 |
| Whooping Cough | — | — | 1.3 | 1.8 | 1.5 | — | — | — | — | 1.4 | — | — | — | 1.6 | 2.8 |
| Diphtheria | — | — | — | — | — | 2.0 | 4.6 | — | — | 1.4 | 1.6 | — | — | 3.2 | 1.4 |
| Catarrh | — | — | 1.3 | — | — | — | — | — | 1.6 | 5.5 | 1.6 | 3.0 | 9.1 | 3.2 | 2.8 |
| Brain Fever | — | — | — | — | 2.9 | — | — | 11.1 | — | — | — | 6.1 | 3.6 | 4.8 | 4.3 |
| Miscellaneous and Unknown | 30.9 | 19.9 | 3.2 | 26.8 | 6.2 | 14.0 | 4.5 | 20.9 | 4.7 | 12.7 | 8.5 | 33.3 | 31.3 | 31.7 | 28.7 |