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