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American Philosophical Society
Measles and Scarlet Fever in Providence, R.I., 1929-1934 with Respect to Age and Size of Family: Proceedings, American Philosophical Society (Vol. 80, No. 3)
Edwin B. Wilson (au); Constance Bennett (au); Marg
The Provident, R.I., records for measles and scarlet fever for the years 1929-1934 inclusive have been worked up for comparison with the earlier findings of Dr. Chapin and Dr. Pope, but have been subtabulated according to size of family. It is shown that the percent age incidence of the diseases in different sizes is itself very different as is shown from the tabulation of a sample of the special Civil Works Admin.-Federal Emergency Relief Admin. census of Boston in Jan. 1934, and these results are used to obtain rates of incidence by age and by size of family. The rate picture is very different from that of the percentage distribution in that the rates are relatively higher at the early ages in the larger families. Special attention is paid to the 2-child family. Greenwood’s mathematical theory for the spread of measles in the family is carefully examined for families of more than 2 susceptibles and it is shown that his theory seems not to be substantiated in that the attack rate on susceptibles who do not get their infection from the primary case but get it from a secondary cases is markedly lower than for those who get it from the primary case. The first and second halves of the great measles epidemic of 1931-2 are compared to show that the incidence by size of family differed in the 2 halves. Finally cases of measles are tabulated for Boston by Wards for 1916-1936 to show that the coefficient of inter-war variation by years is of about the same magnitude as the coefficient of inter-year variation by wards. Illus.
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