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