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. Sex Rongelap (668) 1573 M 829 Age (1979) Length of stay on island (yr) 29 0 40 3 F 46 1l F F F 80(7) 51 (?) 11 (died 1973) 3 13 (?) 938 F F 40 841 858 867 858 3 4023 F 45 2 910 M 49 6 1007 M 68 12 1575 4014 1554 F F F 73 62 60 0 0 ? 980 1524 F M 28 38 5 4 4009 M 35 13 882 M 48 24 (7) 3074 3015 F F 26 41 5 2 (7) 14 13 15 (7) ? Utirik (473) 3006 M F F M F 51 52 23 24 3555 F 23 3042 3058 2279 3565 Wot je (162) 5061 5027 5030 F 78 1 (7) ? 26 mrt F 26 MT M M 33 36 MT MT 5059 F 53 MT 5074 F 68 MT 3096 F 55 MT 5053 F 68 MT M 61 Likiep (173 in 1970) M F M 3023 MT 91(?) MT 73 F 65 F 23 MT = Probably most of the time. MT 85(7) MT 1954-1970 ? *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 -