Table 2.
Percent of unexposed Marshallese (born before 1954)
with thyroid nodules.
Established (1958)
group (Rongelap)
Age
group
(1954)
<10
10-18
>18
All
Added groups*
Combined groups
to
ts
No. Nods. Carcinoma**
ts
Z
No. Nods. Carcinoma**
_ total
te
to
No. Nods. Carcinoma**
58
29
98
86
3.4
6.9
9.2
6.9
1.7
0
1.0
1.1
total
17]
50
194
415
2.3
8.0
7.2
5.3
0.6
0
0.5
0.5
total
229
79
292
600
2.6
7.6
7.9
5.8
*Added unexposed people of Rongelap, Utirik, Wotje, and Likiep.
1, Appendix I, for island breakdown.
0.9
0
0.7
0.7
See Table
**The carcinomas may be underestimated since all unoperated nodules were
considered benign for these calculations.
ine luded under carcinoma.
Table 3.
Group
Ronge lap
"
Utirik
"
Observed/expected thyroid nodules.*
Exposure Age
<18
>18
<18
>18
Occult papillary carcinomas not
No.
Total nodules
42
44
85
79
22/1.6
7/3.5
8/3.3
9/5.7
Carc inoma**
2/0.4
2/0.3
2/0.8
1/0.6
*Based on unexposed Marshallese prevalence:
<18, total nodules 3.9%,
noma 1.0%; >18, total nodules 7.9%, carcinoma 0.7%.
**Does not include occult papillary carcinomas.
~ 60 -
carci-