Table 2. Length of stay on home island of unexposed Marshallese developing thyroid nodules at age >12 (S=surgery). Group (No. in group) Pt. No. Rongelap (668) Sex Age (1979) 1573 M F 40 938 F 40 46 ll 858 F 80(?) 1l (died 858 4023 910 1007 1575 4014 1554 980 1524 4009 F F M M F F F F. M M (2) 45 49 68 73 62 60 28 38 35 13 2 6 12 0 Q ? 5 4 13 (7?) 882 Utirik (473) M 48 24 (7?) 3074 3015 F F 26 4] 5 2 829 841 F 867 F 29 Length of stay on island (yr) 0 3 3 51, 3006 M F 51 14 3058 2279 3565 3555 F M F F 52 23 24 23 13 15 ? ? 3042 Wotje 5061 (162) F 78 3 (2?) 1 (7) 26 (7?) mrt 5030 F M M 26 33 MT MT 5059 5074 3096 F F F 53 68 55 MT MT MT F 68 MT 1970) M 61 MT F M 73 91(7) MT MT F F 65 23 1954-1970 ? 5027 5053 Likiep (173 in M 3023 1973) 36 MT 85(7) MT TMT = Probably most of the time. *A small focus of "occult" cancer reported by a minority of pathologists. Such occult lesions are not infrequently found at autopsy and are generally considered to be of little clinical significance. ~ 106 -