20 
greater prevalence of the disease among males falls especially upon 
those between the ages of 15 and 34 years. 
Another condition probably contributing to the higher rate among 
males is that in the summer months relatively more women than men 
are away from TTashington. Many of the men, after their families 
are gone, take their meals at various eating places instead of at 
home and so are exposed to more possible sources of infection in 
food. 
AGES. 
The following table gives the cases classified by age and sex, 
along with the population of the District of Columbia in 1900 (United 
States Census) : 
Ages, years. 
Number of cases. 
Population, 1900. 
Ratio to total 
population. 
Male. 
Female. 
Total. ‘ 
Male. 
Female. 
Total. 
1908. 
1907. 
0-4 
18 
7 
25 
11,683 
11,467 
23,150 
1-926 
1-1,052 
5-9 
39 
42 
81 
11,708 
12,023 
23,731 
1-293 
1-293 
10-14 
47 
42 
89 
10,953 
11,781 
22,734 
1-255 
1-231 
15-19 
59 
27 
86 
71,362 
13,452 
24,814 
1-288 
1-335 
20-24 i 
i 52 
38 • 
90 
13,774 
17,736 
31,510 
' 1-350 
1-398 
25-29 
35 
26 
61 
13,345 
, 16,410 
29,755 
1-487 
1-419 
30-34 
33 
17 
50 
11,911 
' 12,857 
24,768 
1-495 
1-619 
35-39 
11 
13 
24 
10,409 
11,472 
21,881 
' 1-912 
1-810 
40-44 
1 10 
11 
21 
8,679 
9,255 
17,934 
1-884 
1-2,562 
45-49 
4 
0 
4 
6,876 
7,750 
14,626 
1-3,656 
1-914 
50-54 
1 3 
2 
5 
6,371 
6,928 
13,299 
1-2,659 
1-6,649 
55-59. - 
1 0 
0 
0 
5,285 
5,001 
10,286 
1-3,428 
60-64 
1 2 
2 
4 
4,123 
4,078 
8,201 
1-2,050 
1-4,100 
65-69. 
1 1 
1 
2 
2,431 
1,611 
2,604 
5,035 
3,440 
■ 1-2,517 
70-74 
, 0 
0 
0 
1,829 
1-1,720 
75—79 
^ 0 
0 
0 
796 
1,019 
567 
1,815 
918 
80-84 
0 
0 
0 
351 
85-89 
0 
0 
0 
132 
206 
338 
90-94 
0 
0 
0 
26 
73 
99 
95-99 
0 
0 
0 
10 
29 
39 
Over 99 
0 
0 
0 
6 
14 
20 
Age not knoTvn 
0 
0 
0 
162 
133 
295 
Total 
, 314 
228 
542 
132,004 
146,714 
278,718 
The youngest person affected was 19 months and the oldest 69 
years. 
The figures given of the population in age periods are those of the 
United States Census report and are the latest returns available. 
As the census was taken in 1900 and the cases occurred in 1908, the 
figures from which the ratios are derived are not strictly comparable, 
but give a fairly accurate estimate. 
The largest number of cases proportionate to population again this 
year, as in 1907, occurred among persons from 10 to 14 years of age. 
The next highest ratio, in 1907, was in periods from 5 to 9; but this 
