RNil7
=
ould,
RONGELAP
4
rentTs)
+ Rr LaSigh
4 asians
e
eee
ara tg
Ven
hd
UJAE
°PTT
{>
er)
=>
Pra
Fig 2.—Prevalence of thyroid nodules. Atolls shown in color inset were
previously assumed unexposedto radioiodine from nuclearfaliout.
Table 2.—Proportions of Atoll Populations Screened
for Thyroid Nodularity
ee
Atoll
= 10.
Rongelap
g 9}
Mejit tsland
z
Estimated
Population*
Utrik
Ailuk
= 84
2 73
5 6
Likiep
g 54
Wotje
Maloelap
Lae
& 94
J
Jaluit
Ebon
= 4]
é 34
Ujae
Wotho
7
10
:
r
7
“Distance(mies)
7
500
,
600
Fig 3.—Weighted linear regression. Age-adjusted
prevalence of thyroid nodules weighted by inverse of
population variance is plotted against distance from
BRAVO test on Bikin! Atoll.
ews
tH
100 MILES
Fig 1.—Marshall Islands. BRAVO test site is shown on Bikini Atoll. Peopie on
other atolls were screened for thyroid nodules.
*¥
8.4
aad 0,0 °2.4
rsWe
[oe
tte,
MP eis
4
UTRIK Pte
. "40.6 8
eT ;
100 MILES
=~
RONGELAP
2m)
oo
WOTJE
KWAJALEIN
The Marshall
Islands
o
~38.6
BIKIN,
201
287
278
353
419
Total
22707
4
1
137 (33)
= 4104
187 (70)
34 (46)
8
]
a 05;
217 (61)
te
1723 (16)
5855
1808 (30)
7266 (32)
2
*Projected from 1980 Marshall Islands census data.
tScreening of the entire Kwajalein and Majuro populations was not attempted; only persons from these two
atolls who had lived on the other 13 primary atolls in
1954 were screened.
L
2
759 (59)
517 (65)
6061
1
=o ye
8
184 (64)
1295
792
10791
‘ota
50
122 (61)
364 (78)
443 (83)
149 (72)
269
74
’
263 (95)
486
534
206
teat
Majurot
Kwajaleint
Total No. (%)
Screened
ee
B
:
:
:
4
;
{
4
3 1
£
4
g
1
1
°>
p———
100
200
———+#
300
400
Drstance (miles)
5-2
500
600
:
A
Fig 4.—Logistic regression anatysis. Probability of
thyroid nodule developing in an individual (from
fitted logistic model) is shown for each sex, given
mean age, as function of distance from Bikini Atoll.
Actual prevalence data are also plotted. Females,
top curve, and males, bottom curve.
BIKINI
Re
art.)
Fig 5.— Probability contours. Graph shows fitted probability contours for thyroid
nodules for females, computed from complete logistic model. Distance was
calculated for each contour of fixed probability, given mean ageof females, for
values of 8 from 0° to 80°.
JAMA, Aug 7, 1987—Vol 258, No. 5
Thyroid Neoplasia—Hamilton et al
631
are ee am
|
Totem Ta at)