Table 1 Summary of Thyroid Abnormalities in the Marshallese Unexposed Comparison Groups 1954-1983 Group Age 1954 Number Total Nodules Carcinoma 229 6 2 _ <10 Hypofunction 10-18 79 6 1 1 >18 292 25 2 1 600 37 5 2 227 5 2 -- Total Age~ and SexMatched Group Followed Since 1954 Table 2 Age Group <10 Data Summary Number of PersanS. ssecccccrsesececewccn rene ccen ses sreresssesesceceessesseees OD Internal Exposure, PersonRad... .csccccssctccccssccnncsuscesseesceese 120,000 External Exposure, Person—Radssccessevccsccssensseesssacsssessseseesesas 35400 Number of Observed Carcinomas. c.ccseccccccvcrsecnnetntsccvevensssesesssveene f Average Years Post-Exposure to Onset of Carcinoma. -cceccesssecsccssssune Assumed Latent Period, Number of Expected Years. .ccccscsccsecsscnccnsscssecseeesensecess Spontaneous CaTciNoOMaS se 24 22 2 and 10 csccsenrevevecseesssneseseens 0.80