143
others after long periods varying between 101 and 182 days: the majority how- ever succumbed after much shorter periods which varied each year.
Average Residence in Days.
Year.
Males.
Females.
1896,
20
16
1897,
32
42
1898,
18
28
1899,
32
1900,
23
38
1901,
23
12
1902,
25
36
1903,
45
35
1904,
14
15
We may conclude from this Table that the severity of the disease varies from year to year that in some years it runs a rapid course and carries off the patient quickly, that in other years when the type is not so grave it runs a slower course. We may also infer, froin the prolonged duration of treatment that the type and severity may undergo variation in the same year.
The Mortality with reference to Age.
On reference to Table No. VII, and a study of the curve it will be seen that the aggregate mortality during the ten years under review reaches its height in the quinquennial age-period 26-30. From the age of 6 to 15 years the curve is flat; thereafter there is a rapid rise in each of the next periods 16-20 and 21-25: and the curve reaches its height during the years 26-30. After that there is a -consistent rapid fall till the age-period 41-45 and there a slow fall till it approa- ches the base line and runs fairly flat during the last three quinquenniads 61-65, 66-70, 71-75. Here we note a similarity to the admission curve (q.v.). The lar- gest number of admissions occurs between the ages of 21-30: the largest number of deaths between the same ages. It would seem that the fatality of the disease is great in early adult life, and bears a proportionate relation to the numbers attacked.
The mortality curve for females runs a fairly level course though there is a heightening of it during the quinquenniads 16-20, 21-25, 26-30.
Rate of Mortality according to Sex and Age Periods.
Percentage of
Period.
Total Percentage.
Males. Females.
6-10
43
50
40
11-15
40.6
37.5
43
16-20
38.4
13
17.5
21-25
45
46.3
23
26-30
51
51.4
39
31-35
50
50
57
36-40
55
55
58
41-45
51
50.3
75
46-50
45
45
33
51-55
59
59
50
56-60
70
66.6
100
61-65
41.5
30
100
66-70
90
75
100
71-75
33
50
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