63 
to show approximately to what extent a combination of conditions 
exists. Following the age column from section 1 (lightly infected) to 
section 7 (heavily infected), it is apparent that the proportion of 
younger patients decreases as we pass to the more heavily infected sec- 
tions; indeed, it is considerably less in the sections (6 and 7) showing 
the highest rates of infection than in those (1 and 2) showing the 
lowest. Since we have found the relation between age and the rate of 
infection to differ in the two sexes at the Connecticut hospital (see 
pp. 26, 27), it is significant that this tendency to a greater proportion of 
older patients on the heavity-infested sections is confined for the most 
part to the female sections, the male sections showing but little 
variation in the proportionate number of patients of different ages. 
Considering the length of time that the patients had been in the 
hospital, we find that the proportion of patients of long hospital resi- 
dence increases with the rate of infection. In section 1, with only 2.56 
percent of infections, over 65 per cent of the patients had been admitted 
to the hospital within three 3 ^ears. Sections 6 and 7, with 26.09 and 
53.33 per cent of infections, show in the one case about 60 per cent 
and in the other 66 per cent of the patients with a hospital residence of 
over nine years. 
Regarding the nativity of the patients, there is a higher proportion 
of foreign-born patients upon the 2 sections having a higher rate of 
infection than upon the more lightly infected sections, and the condi- 
tions in other sections also seem to be in general in harmony with the 
data of the sections in question. 
In section 1 it is seen that 143 of the 195 patients are native Amer- 
icans. In section 7, 40 of the 75 patients are of foreign birth. While 
there is this general tendency to a higher proportion of foreign-born 
patients upon the sections showing the higher rates of infection, there 
is a marked exception in section 5, the most highly infected male 
section (13.73 per 100), which, with 145 native and 53 foreign born, 
presents about the same proportion as does section 1 . It is worthy of 
note, however, that this single exception to the general tendency 
above noted is the one section upon which the pinworm furnished 
most of the infections, and the pinworm we have already found to 
show a slightly higher prevalence among natives (see p.44 ). 
In general, then, we find upon the sections showing the higher fre- 
quency of intestinal worms a tendency to a greater proportion of 
patients of long institutional life, of foreign birth, and, particularly 
among the females of advanced age as well, conditions which we have 
already found to be apparently predisposing to intestinal worms, 
especially among the Connecticut cases. 
The question naturally follows whether the combined influence of 
sex, age, nativity, and length of hospital life is sufficient to explain the 
wide differences in the amount of infection found in the various wards 
and sections. 
