Table 2. Percent of unexposed Marshallese (born before 1954) with thyroid nodules. Established (1958) group (Rongelap) Added groups* Combined groups ’ 4 No. Nods. Carcinoma** &. 4 No. Nods. Carcinoma** total Age group (1954) hs % No. Nods. Carcinoma** total total <10 58 3.4 1.7 171 2.3 0.6 229 2.6 0.9 10-18 >18 All 29 98 86 6.9 9.2 6.9 0 1.0 L.l 50 194 415 8.0 7.2 5.3 0 0.5 0.5 79 292 600 7.6 7.9 5.8 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. 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. 42 44 85 79 *Based on unexposed Marshallese prevalence: Total nodules 22/1.6 7/3.5 8/3.3 9/5.7 2/0.4 2/0.3 2/0.8 1/0.6 <18, total nodules 3.9%, carci- noma 1.0%; >18, total nodules 7.9%, carcinoma 0.7%. *kDoes not include occult papillary carcinomas. - 60 ~ Care inoma**