Table 1 Summary of Thyroid Abnormalities in the Marshallese Unexposed Comparison Groups 1954-1983 Group Age 1954 Total Number Nodules Carcinoma Hypofunction <10 229 6 2 -- 10-18 79 6 1 1 >18 292 25 2 1 Total | 600 37 5 2 227 5 2 -- Age- and SexMatched Group Followed Since 1954 Table 2 Age Group <10 Data Summary Number of Persons. .csrcenccscceresccereceeeessceeesccessecersscacersseceses BO Internal Exposure, PersonRadsscssccssscccnccccsntccsssccsenscessesse 120,000 External Exposure, Person-Rad.c.cccescccevccenens eanees ee wnccescseceeses§ 5400 Number of Observed Carcinomas. cccuccacccvscsccsscessscevsnsensssccvasseceves J Average Years Post-Exposure to Onset of Carcinomas. cccceccsccnencccesecce 22 Assumed Latent Perlod, Years.sscccecrecesnssectecscnscesrenestocesese J and 10 Number of Expected Spontaneous Carcinomas... sssseevseccessevesesscseees Cc cca pd ot Cr") soy CF 24 1,80