Variations in the Age-Incidence of Mortality from Certain Diseases
نویسنده
چکیده
period forms a curved line above or below the mean. It is obvious that by this method any deviation from a straight line represents variation in the age-incidence of mortality. The first diagram (Fig. 1) which I will ask you to look at is based upon the deaths in London from diphtheria and croup, from the period 1859 to 1905. The first period, represented by a curved line, relates to the years 1859 and 1860, while all other lines relate to quinquennial periods. The curves of 1859-1860 and 1861-1865 closely resemble each other. The line is bent with the convexity downwards, the ages 4, 5 to 10, and 10 to 15 being in the second period, the three lowest points in the curve.
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