70 
Examined. 
Infected. 
Per 100 
persons. 
Trichuris triekiura: 
Males 
1,543 
267 
17.30 
Females 
810 
165 
20.37 
Ascaris lumbricoides: 
Males 
1,732 
138 
7.97 
Females 
1,103 
159 
14.42 
Oxyuris vermicularis: 
Males 
1,543 
178 
11.54 
Females 
810 
115 
14.20 
Taenia saginata: 
Males 
846 
20 
2.36 
Females 
324 
19 
5.86 
Taenia solium: 
Males 
846 
15 
.1.77 
F emales 
324 
/ 
2.16 
Dibothnocepbalus latus: 
Males 
S46 
51 
6.03 
remales 
324 
59 
IS. 21 
All intestinal worms: 
Males 
2,008 
672 
33.47 
Females 
1,191 
531 
44.58 
It appears from the above figures that the females gave a higher 
percentage of infection than the males, both in the rate of total infec- 
tion and in the rate of infection with each species of intestinal worm 
for which statistics for the two sexes were available. In the total 
results for all parasites considered, males gave about three-fourths as 
many infections per 100 persons as did the females. The excess of 
infection among female patients varied in the different species. Dibo- 
thriocephalus gave something over three times as many infections per 
100 persons among the females as among the males, and Ascaris 
nearly twice as many; in the cases of the other species considered 
the difference between the rates of infection in the two sexes was less 
pronounced. 
It has been a more difficult matter to summarize the results of other 
investigations regarding the relation found to exist between age and 
the prevalence of worms in the intestine, because of the fact that the 
age-groups of different authors do not correspond — that is, they do not 
include the same years. For instance, Grusdeff's group of patients 
from 9 to 18 years of age can not be combined with either of Baran- 
ovski’s groups of from 10 to 15 or from 15 to 20 years. If we place 
these three groups together in the larger group of from 9 to 20 years 
the same difficulty arises, since this group overlaps several other 
groups, 5 to 10 years, 15 to 30 years, etc., arranged by other authors. 
