Diphthe, ia—Annual case rates per 1,000 population, January to October, 1921 and 1920, and medians for the years 1913 to 1920, inclusive-Continued. SCARLET FEVER IN THE UNITED STATES. The accompanying table shows the number of reported cases of scarlet fever per 1,000 population by quarters, from January to June, and by months, from July to October, 1921, compared with the same periods during 1920, and the medians for 1913 to 1920, inclusive. The median was ascertained by arraying the figures so that the greatest number was first, the next smaller number was second, and so on to the smallest number, which was placed last. The middle number of the array was then selected as the median. Data were not available for all the States for the full eight years. As many years as possible were included for each State, but no year earlier than 1913 was used. The first column shows the number of years for which figures were obtained for each State. Diphtheria-Annual case rates per 1,000 population, January to October, 1921 and 1920, and medians for the years 1913 to 1920, inclusive-Continued. Diphtheria-Annual case rates per 1,000 population, January to October, 1921 and 1920, and medians for the years 1913 to 1920, inclusive-Continued. SCARLET FEVER IN THE UNITED STATES. · The accompanying table shows the number of reported cases of scarlet fever per 1,000 population by quarters, from January to June, and by months, from July to October, 1921, compared with the same periods during 1920, and the medians for 1913 to 1920, inclusive. The median was ascertained by arraying the figures so that the greatest number was first, the next smaller number was second, and so on to the smallest number, which was placed last. The middle number of the array was then selected as the median. Data were not available for all the States for the full eight years. many years as possible were included for each State, but no year earlier than 1913 was used. The first column shows the number of years for which figures were obtained for each State. The estimated populations on which the rates were computed are as follows: For comparison the death rates per 100,000 population in the registration area for deaths are shown in the following table: Scarlet fever death rates per 100,000 population in registration area for deaths, 1913-1920, Scarlet fever-Annual case rates per 1,000 population, January to October, 1921 and 1920, and medians for the years 1913 to 1920, inclusive. |