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*
total
%
%
No. Nods. Carcinoma**
58
29
98
86
3.4
6.9
9.2
6.9
1.7
0
1.0
1.1
Combined groups
total
4
ts
total
No. Nods. Carcinoma**
171
50
194
415
2.3
8.0
7.2
5.3
0.6
0
0.5
0.5
&
4
No. Nods. Carcinoma**
229
79
292
600
2.6
7.6
7.9
5.8
0.9
0
0.7
0.7
*Added unexposed people of Rongelap, Utirik, Wotje, and Likiep. See Table
1, Appendix I, for island breakdown.
**kThe carcinomas may be underestimated since all unoperated nodules were
considered benign for these calculations. Occult papillary carcinomas not
included under carcinoma.
Table 3.
Group
Observed/expected thyroid nodules.*
Exposure Age
No.
Total nodules
Carcinoma**
Ronge lap
<18
42
22/1.6
2/0.4
Utirik
<18
85
8/3.3
2/0.8
"
"
>18
>18
44
79
7/3.5
9/5.7
2/0.3
1/0.6
*Based on unexposed Marshallese prevalence:
<18, total nodules 3.94%, carcinoma 1.0%; >18, total nodules 7.9%, carcinoma 0.7%.
**Does not include occult papillary carcinomas.
- 60 -