18 
LENGTH OE RESIDENCE. 
The length of residence in the District of Columbia of the persons 
affected was as follows : 
Length of residence : Cases. 
Under six months 20 
6 months to 1 rear 15 
1 to 2 years 28 
2 to 3 years 16 
3 to 4 years 19 
4 to 5 years c 17 
5 to 10 years 62 
10 to 15 years 26 
15 to 20 years 16 
20 to 30 years 18 
30 to 40 years . 7 
40 to 50 years 4 
50 to 60 years 1 
Life 239 
Not determined 35 
523 
The ages of the :239 life residents of the District of Columbia 
affected tvere as follows: 
Ages : 
0 
to 
4 
years. 
5 
to 
9 
years. 
10 
to 
14 
years. 
15 
to 
19 
years. 
20 
to 
24 
years. 
25 
to 
29 
years. 
30 
to 
34 
years. 
35 
to 
39 
years. 
40 
to 
44 
years. 
45 
to 
49 
years. 
Cases. 
__ 17 
55 
__ 67 
38 
__ 23 
22 
8 
1 
1 
239 
Xearly 50 per cent of the cases were among persons who had 
resided in the District of Columbia all their lives, so the disease can 
not be considered to have prevailed to any very unusual extent 
among newcomers. However, it should be noted that the number 
of cases, 115, among persons who had resided in the District less 
than five years was nearly twice as large as the number, 62, among 
Iversons who had resided in the District for five to ten years, and over 
four times as large as the number, 26, among those who had resided 
in the District from ten to fifteen years. 
In considering these figures Ave should take into account that the 
transient element of IVashington's population is rather large, and 
that among persons who haA^e liA'ed in the District less than ten years 
there is, of course, a large proportion of children. 
